{"id":53319,"date":"2024-06-30T00:33:07","date_gmt":"2024-06-29T23:33:07","guid":{"rendered":"https:\/\/phillipreeve.net\/blog\/?p=53319"},"modified":"2026-03-23T14:33:40","modified_gmt":"2026-03-23T13:33:40","slug":"review-zeiss-zm-21mm-4-5-c-biogon","status":"publish","type":"post","link":"https:\/\/phillipreeve.net\/blog\/review-zeiss-zm-21mm-4-5-c-biogon\/","title":{"rendered":"Review: Zeiss ZM 21mm 4.5 C-Biogon"},"content":{"rendered":"<h2>Introduction<\/h2>\n<figure id=\"attachment_53370\" aria-describedby=\"caption-attachment-53370\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53370\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_M6.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_M6.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_M6-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_M6-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53370\" class=\"wp-caption-text\">Zeiss ZM 21mm 4.5 C-Biogon on Leica M6<\/figcaption><\/figure>\n<p>The Zeiss ZM 21mm 4.5 C-Biogon is the widest of the three &#8220;Classic&#8221; designs in Zeiss&#8217; ZM line up. It has long been discontinued and it wasn&#8217;t in production for a long time, so it is a bit rare and rather expensive on the used market. I always wondered how it would compare to the similarly compact yet newer <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-3-5-color-skopar\/\">Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar<\/a> and now we will finally find out.<br \/>\n<em>Lens is being tested on 42mp Sony A7rII and 24mp Leica M10<\/em><\/p>\n<h2>Sample Images<\/h2>\n<figure id=\"attachment_53685\" aria-describedby=\"caption-attachment-53685\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-53685 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_17_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_17_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_17_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_17_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53685\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<figure id=\"attachment_53677\" aria-describedby=\"caption-attachment-53677\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53677\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_13_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_13_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_13_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_13_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53677\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<figure id=\"attachment_53398\" aria-describedby=\"caption-attachment-53398\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53398\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_2_M10_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_2_M10_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_2_M10_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_2_M10_4.5-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53398\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/4.5<\/figcaption><\/figure>\n<figure id=\"attachment_53927\" aria-describedby=\"caption-attachment-53927\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53927\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_24_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_24_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_24_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_24_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53927\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<figure id=\"attachment_53397\" aria-describedby=\"caption-attachment-53397\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53397\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_1_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_1_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_1_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_1_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53397\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53922\" aria-describedby=\"caption-attachment-53922\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53922\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_19_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_19_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_19_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_19_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53922\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<figure id=\"attachment_53925\" aria-describedby=\"caption-attachment-53925\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53925\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_22_M10_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_22_M10_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_22_M10_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_22_M10_4.5-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53925\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/4.5<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<p><em>Most of the sample images in this review can be found in full resolution <a href=\"https:\/\/flic.kr\/s\/aHBqjCkfwK\">here<\/a>.<\/em><\/p>\n\n<h2>Disclosure<\/h2>\n<p>The Zeiss ZM 21mm 4.5 C-Biogon was kindly provided free of charge by our reader Matthew for review purposes, thanks a lot!<\/p>\n<h2>Specifications<\/h2>\n<p>This Zeiss ZM 21mm 4.5 C-Biogon has the following specifications:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Diameter: 53 mm<\/li>\n<li>Field of view: 90\u00b0 (diagonally)<\/li>\n<li>Length: 31 mm<\/li>\n<li>Weight: 194g (without hood and caps)<\/li>\n<li>Filter Diameter: 46 mm<\/li>\n<li>Number of Aperture Blades: 10 (straight)<\/li>\n<li>Elements\/Groups: 8\/6<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53320\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Diagram.png\" alt=\"\" width=\"253\" height=\"196\"><\/li>\n<li>Close Focusing Distance: 0.50 m<\/li>\n<li>Maximum Magnification: ~1:20 (measured)<\/li>\n<li>Mount: Leica-M<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><em>The Zeiss ZM 21mm 4.5 has long been discontinued, it can sometimes be found on <a href=\"https:\/\/www.ebay.com\/sch\/i.html?_from=R40&amp;_trksid=p4432023.m570.l1313&amp;_nkw=zeiss+zm+21mm+4.5&amp;_sacat=0&amp;mkcid=1&amp;mkrid=711-53200-19255-0&amp;siteid=0&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.com<\/a> | <a href=\"https:\/\/www.ebay.de\/sch\/i.html?_from=R40&amp;_trksid=p4432023.m570.l1313&amp;_nkw=zeiss+zm+21mm+4.5&amp;_sacat=0&amp;mkcid=1&amp;mkrid=707-53477-19255-0&amp;siteid=77&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.de<\/a> for about <strong>$850<\/strong> (advertisement\/affiliate links)<\/em><\/p>\n<h2>Handling \/ Build Quality<\/h2>\n<figure id=\"attachment_53363\" aria-describedby=\"caption-attachment-53363\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53363\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53363\" class=\"wp-caption-text\">Zeiss ZM 21mm 4.5 C-Biogon<\/figcaption><\/figure>\n<p>Generally the Zeiss ZM lenses are nicely made, very similar to the Voigtl\u00e4nder VM lenses which are also made by Cosina in Japan.<\/p>\n<p>The focus ring has a nice and even resistance and travels ~120\u00b0 from the minimum focus distance (0.5 m) to infinity. The focus ring does not feature a real focus tab, but a small focus &#8220;knudge&#8221; at the bottom.<\/p>\n<p>The aperture ring has one-of-a-third-stop click-stops. It travels a little less than 90\u00b0 from f\/4.5 to f\/22 and the stops are spaced equidistantly as it should be.<\/p>\n<p>Most parts seem to be made from metal and all markings are engraved and filled with paint. Instead of a red dot this lens features a small blue dot as indicator for mounting the lens to the camera.<\/p>\n<figure id=\"attachment_53377\" aria-describedby=\"caption-attachment-53377\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-53377 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_Comparison_1.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"382\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_Comparison_1.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_Comparison_1-300x143.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_Comparison_1-768x367.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53377\" class=\"wp-caption-text\">VM 21mm 3.5 and Leica 21mm finder on M10 | ZM 21mm 4.5 and Zeiss 21mm finder on M6<\/figcaption><\/figure>\n<p>M-mount cameras do not feature framelines for 21mm lenses, so unless your camera is equipped with liveview you need an accessory finder for framing. For the use of my <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-3-5-color-skopar\/\">Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar<\/a> on the M6 I bought an old Leica 21mm finder. As the onwer of this ZM 21mm 4.5 also send me his Zeiss ZM 21mm finder, I am now able to compare them and the Zeiss finder is better in every possible way: material, image quality, distortion, fit to camera. That being said, I paid around 150\u20ac for the Leica one, whereas this one from Zeiss is at least double that.<\/p>\n<figure id=\"attachment_53365\" aria-describedby=\"caption-attachment-53365\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53365\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Hood_2.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Hood_2.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Hood_2-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Hood_2-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53365\" class=\"wp-caption-text\">Zeiss ZM 21mm 4.5 C-Biogon on Leica M10 with hood attached<\/figcaption><\/figure>\n<p>The lens features a bayonet for attaching a lens hood. It shares the official square hood with the Zeiss ZM 21mm 2.8 and ZM 25mm 2.8. It is a pricey accessory and mainly a cosmetic one. Because it is so short it won&#8217;t actually help with shading the lens.<\/p>\n<figure id=\"attachment_53376\" aria-describedby=\"caption-attachment-53376\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53376\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_1.4_Nokton_Comparison.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"331\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_1.4_Nokton_Comparison.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_1.4_Nokton_Comparison-300x124.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Voigtlander_3.5_Color-Skopar_1.4_Nokton_Comparison-768x318.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53376\" class=\"wp-caption-text\">Zeiss ZM 21mm 4.5 C-Biogon | Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar | Voigtl\u00e4nder VM 21mm 1.4 Nokton<\/figcaption><\/figure>\n<p>The <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-3-5-color-skopar\/\">Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar<\/a> is thinner at the front and a few grams lighter than the Zeiss ZM 21mm 4.5 &#8211; despite being slightly faster. I also added the <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-1-4-nokton\/\">Voigtl\u00e4nder VM 21mm 1.4 Nokton<\/a>, one of the bigger 21mm M-mount lenses.<\/p>\n<h2>Vignetting<\/h2>\n<h3>light falloff<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53384\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/vignetting_Zeiss_ZM_21mm_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"750\" height=\"610\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/vignetting_Zeiss_ZM_21mm_4.5.jpg 750w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/vignetting_Zeiss_ZM_21mm_4.5-300x244.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<p>Small lenses like this&nbsp; usually show a high amount of vignetting and this Zeiss ZM 21mm 4.5 no exception. Wide open the light falloff amounts to 3.2 EV and there is only little improvement on stopping down, as it only improves to 2.8 EV stopped down. You can either correct this in Lightroom or directly in camera. There is a Lightroom profile available for this lens.<\/p>\n<p>I checked the vignetting on a Sony A7rII here. The values will be very similar on the Leica M11 and slightly better on the M10. On film the lens will also show less falloff.<\/p>\n<figure id=\"attachment_53410\" aria-describedby=\"caption-attachment-53410\" style=\"width: 1026px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53410\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Vig_Graph.png\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"1026\" height=\"766\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Vig_Graph.png 1026w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Vig_Graph-300x224.png 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Vig_Graph-800x597.png 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Vig_Graph-768x573.png 768w\" sizes=\"auto, (max-width: 1026px) 100vw, 1026px\" \/><figcaption id=\"caption-attachment-53410\" class=\"wp-caption-text\">Zeiss ZM 21mm 4.5 C-Biogon<\/figcaption><\/figure>\n<p><em>It is recommended to have a look at <a href=\"https:\/\/phillipreeve.net\/blog\/vignetting-graphs-explained\/\">this article<\/a> first to get an idea how this brightness graph works.<\/em><\/p>\n<h3>color cast<\/h3>\n<figure id=\"attachment_53338\" aria-describedby=\"caption-attachment-53338\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53338\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Color_Cast.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Color_Cast.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Color_Cast-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Color_Cast-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53338\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 | f\/5.6<\/figcaption><\/figure>\n<p>The &#8220;C&#8221; in this lens&#8217; name stands for &#8220;Classic&#8221; and this means two things: no aspherical elements and a semi-symmetrical Biogon design. When it comes to digital sensors, those are not great news. In scenes with an overcast sky, on the later Sony cameras with BSI sensor (and the Leica M10) you may be able to see a very slight greenish\/blue color cast in the corners. On the Leica M10 the situation is worse, here we see a strong asymmetrical color cast with the red side of the frame showing noticeable magenta color cast. The situation will be even worse on older digital M-mount cameras, as show <a href=\"http:\/\/www.waloszek.de\/m240_zs21_e.php\" target=\"_blank\" rel=\"noopener\">here<\/a> for the M240.<\/p>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-1-review-zeiss-zm-21mm-4-5-c-biogon-81419\"><li class=\"active\"><a href=\"#ert_pane1-0\" data-toggle=\"tab\">uncorrected<\/a><\/li><li class=\"\"><a href=\"#ert_pane1-1\" data-toggle=\"tab\">corrected<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-1-review-zeiss-zm-21mm-4-5-c-biogon-81419\"><li class=\"tab-pane active\" id=\"ert_pane1-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53396\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_unCorrected.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_unCorrected.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_unCorrected-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_unCorrected-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane1-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53395\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_Corrected.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_Corrected.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_Corrected-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_Corrected-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><em><span style=\"color: #999999;\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/span><\/em><\/p>\n<p>I have a whole <a href=\"https:\/\/phillipreeve.net\/blog\/how-to-correcting-color-cast-in-lightroom\/\">article on how to correct this color cast<\/a>, here it is not that severe, so a simple digital gradient did the trick and I used that for most of the sample pictures in this review.<\/p>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-2-review-zeiss-zm-21mm-4-5-c-biogon-45527\"><li class=\"active\"><a href=\"#ert_pane2-0\" data-toggle=\"tab\">Zeiss ZM 21mm 4.5<\/a><\/li><li class=\"\"><a href=\"#ert_pane2-1\" data-toggle=\"tab\">Voigtl\u00e4nder VM 21mm 3.5<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-2-review-zeiss-zm-21mm-4-5-c-biogon-45527\"><li class=\"tab-pane active\" id=\"ert_pane2-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53394\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Color_Cast_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane2-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53385\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/VM_21mm_3.5_Color-Cast_Comparison.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/VM_21mm_3.5_Color-Cast_Comparison.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/VM_21mm_3.5_Color-Cast_Comparison-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/VM_21mm_3.5_Color-Cast_Comparison-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><span style=\"color: #999999;\"><em>Leica M10<\/em><\/span><\/p>\n<p>This is an area where the <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-3-5-color-skopar\/\">Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar<\/a> does way better, as it has been optimized for digital cameras. As we can see from this comparison the Voigtl\u00e4nder is also slightly wider.<\/p>\n<h2>Sharpness<\/h2>\n<h3>infinity (42mp Sony A7rII and 24mp Leica M10)<\/h3>\n<div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-3-review-zeiss-zm-21mm-4-5-c-biogon-87831\"><li class=\"active\"><a href=\"#ert_pane3-0\" data-toggle=\"tab\">Leica M10<\/a><\/li><li class=\"\"><a href=\"#ert_pane3-1\" data-toggle=\"tab\">Sony A7rII<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-3-review-zeiss-zm-21mm-4-5-c-biogon-87831\"><li class=\"tab-pane active\" id=\"ert_pane3-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53382\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_M10.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"1157\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_M10.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_M10-207x300.jpg 207w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_M10-768x1111.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane3-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53416\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_R2.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"1158\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_R2.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_R2-207x300.jpg 207w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Sharpness_Zeiss_ZM_21mm_4.5_R2-768x1112.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-4-review-zeiss-zm-21mm-4-5-c-biogon-88354\"><li class=\"active\"><a href=\"#ert_pane4-0\" data-toggle=\"tab\">Leica M10<\/a><\/li><li class=\"\"><a href=\"#ert_pane4-1\" data-toggle=\"tab\">Sony A7rII<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-4-review-zeiss-zm-21mm-4-5-c-biogon-88354\"><li class=\"tab-pane active\" id=\"ert_pane4-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53408\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_M10.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_M10.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_M10-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_M10-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane4-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53409\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_R2.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_R2.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_R2-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Infinity_11_R2-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><em><span style=\"color: #999999;\">Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/span><\/em><\/p>\n<p><em>The color cast in the corner crops has been corrected.<\/em><\/p>\n<p>Over most of the frame the Zeiss ZM 21mm 4.5 shows a good performance from f\/4.5 on the Leica M10. The corners look a bit worse, peak across frame performance is reached around f\/8.0.<\/p>\n<p>On a Sony camera with its <a href=\"https:\/\/phillipreeve.net\/blog\/review-kolari-ultra-thin-sensor-stack-modification\/\">thicker filter stack<\/a> the performance starts to drop in the midfield and the corners look really bad, even stopped down to f\/11 they still don&#8217;t look particularly good.<\/p>\n<p>I was wondering how the Zeiss ZM 21mm 4.5 compares to the Voigtl\u00e4nder VM 21mm 3.5 on the Leica M10, so I shot them side-by-side to find out.<\/p>\n<p>The Voigtl\u00e4nder at f\/3.5 to f\/4.5 shows better resolution in the corners, but in the outer midframe &#8211; the area shortly before the corners &#8211; the Zeiss ZM looks better. Generally the Zeiss also shows slightly higher contrast.<\/p>\n<p>Now at f\/8.0 to f\/11 both lenses look very similar, only in that outer midframe area the Zeiss still looks better.<\/p>\n<h3>close 0.50 m (42mp Sony A7rII)<em><br \/>\n<\/em><\/h3>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-5-review-zeiss-zm-21mm-4-5-c-biogon-59316\"><li class=\"active\"><a href=\"#ert_pane5-0\" data-toggle=\"tab\">f\/4.5<\/a><\/li><li class=\"\"><a href=\"#ert_pane5-1\" data-toggle=\"tab\">f\/5.6<\/a><\/li><li class=\"\"><a href=\"#ert_pane5-2\" data-toggle=\"tab\">f\/8.0<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-5-review-zeiss-zm-21mm-4-5-c-biogon-59316\"><li class=\"tab-pane active\" id=\"ert_pane5-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53509\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_4.5-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane5-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53510\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_5.6.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_5.6.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_5.6-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_5.6-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane5-2\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53511\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sharpness_Close_0.5m_8.0-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><em><span style=\"color: #999999;\">Sony A7rII | Zeiss ZM 21mm 4.5 | 100% crops from center<\/span><\/em><\/p>\n<p>A minimum focus distance of 0.5 m is not that exciting for a 21mm lens but the good thing is that in the center the performance is really great already at the maximum aperture. These crops are full of moir\u00e9 after all.<\/p>\n<h2>Flare resistance<\/h2>\n<p>As always evaluating flare is a complex matter since you can get any lens to look bad if you push it hard enough and a slight change of scenario will affect results a lot.<\/p>\n<p>The Zeiss ZM lenses have generally been good albeit not excellent performers in this category and this is also true for this ZM 21mm 4.5, as it is pretty hard to create unwanted artefacts with this lens. Nevertheless, there are a few things to watch out for.<\/p>\n<figure id=\"attachment_53401\" aria-describedby=\"caption-attachment-53401\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53401\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_5_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_5_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_5_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_5_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53401\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<p>With the sun outside the frame it is possible to catch a faint ghost in one of the corners as can be seen above.<\/p>\n<figure id=\"attachment_53680\" aria-describedby=\"caption-attachment-53680\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53680\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_16_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_16_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_16_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_16_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53680\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<p>With a strong light source in the frame also a small crescent can appear (top right corner). These are the two worst artefacts I managed to create, which already is a testament to good performance in this category. The contrast also stays on a high level, even in scenes with strong backlight as seen above and many of the other sample images.<\/p>\n<h2>Coma<\/h2>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-6-review-zeiss-zm-21mm-4-5-c-biogon-30929\"><li class=\"active\"><a href=\"#ert_pane6-0\" data-toggle=\"tab\">f\/4.5<\/a><\/li><li class=\"\"><a href=\"#ert_pane6-1\" data-toggle=\"tab\">f\/5.6<\/a><\/li><li class=\"\"><a href=\"#ert_pane6-2\" data-toggle=\"tab\">f\/8.0<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-6-review-zeiss-zm-21mm-4-5-c-biogon-30929\"><li class=\"tab-pane active\" id=\"ert_pane6-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53329\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_4.5-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane6-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53330\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_5.6.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_5.6.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_5.6-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_5.6-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane6-2\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53331\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Coma_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><span style=\"color: #999999;\"><em>Leica M10 | Zeiss ZM 21mm 4.5 | 100% crops from extreme corner | focused on center<\/em><\/span><\/p>\n<p>At f\/4.5 Coma can be noticeable but improves significantly at f\/5.6, so I recommend to stop down to at least f\/5.6 when taking pictures of a city scene with point light sources.<\/p>\n<h2>Distortion<\/h2>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-7-review-zeiss-zm-21mm-4-5-c-biogon-59565\"><li class=\"active\"><a href=\"#ert_pane7-0\" data-toggle=\"tab\">uncorrected<\/a><\/li><li class=\"\"><a href=\"#ert_pane7-1\" data-toggle=\"tab\">corrected<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-7-review-zeiss-zm-21mm-4-5-c-biogon-59565\"><li class=\"tab-pane active\" id=\"ert_pane7-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53508\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion_uncorrected.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion_uncorrected.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion_uncorrected-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion_uncorrected-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane7-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53507\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion__corrected.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion__corrected.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion__corrected-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Distortion__corrected-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><em><span style=\"color: #999999;\">Leica M10 | Zeiss ZM 21mm 4.5 | f\/8.0<\/span><\/em><\/p>\n<p>The Zeiss ZM 21mm 4.5 shows low but slightly wavy distortion. There is a Lightroom profile available for this. I think it overcorrects distortion a bit and I used a setting of around 40 for this corrected version.<\/p>\n<h2>Sunstars<\/h2>\n<p><div class=\"osc-res-tab tabbable   osc-tabs-left\"><div style=\"clear:both;width: 100%;\"><ul class=\"nav osc-res-nav nav-tabs osc-tabs-left-ul\" id=\"oscitas-restabs-8-review-zeiss-zm-21mm-4-5-c-biogon-36076\"><li class=\"active\"><a href=\"#ert_pane8-0\" data-toggle=\"tab\">f\/4.5<\/a><\/li><li class=\"\"><a href=\"#ert_pane8-1\" data-toggle=\"tab\">f\/5.6<\/a><\/li><li class=\"\"><a href=\"#ert_pane8-2\" data-toggle=\"tab\">f\/8.0<\/a><\/li><li class=\"\"><a href=\"#ert_pane8-3\" data-toggle=\"tab\">f\/11<\/a><\/li><li class=\"\"><a href=\"#ert_pane8-4\" data-toggle=\"tab\">f\/16<\/a><\/li><li class=\"\"><a href=\"#ert_pane8-5\" data-toggle=\"tab\">f\/22<\/a><\/li><\/ul><\/div><div style=\"clear:both;width: 100%;\"><ul class=\"tab-content\" id=\"oscitas-restabcontent-8-review-zeiss-zm-21mm-4-5-c-biogon-36076\"><li class=\"tab-pane active\" id=\"ert_pane8-0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53332\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_4.5-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane8-1\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53333\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_5.6.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_5.6.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_5.6-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_5.6-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane8-2\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53334\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane8-3\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53335\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane8-4\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53336\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_16.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_16.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_16-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_16-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><li class=\"tab-pane \" id=\"ert_pane8-5\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-53337\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_22.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_22.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_22-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_C-Biogon_Sunstars_50_22-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/li><\/ul><\/div><\/div><em><span style=\"color: #999999;\">Leica M10 | Zeiss ZM 21mm 4.5 | 50% crops<\/span><\/em><\/p>\n<p>Like most of the Voigtl\u00e4nder M-mount lenses the Zeiss ZM series lenses also feature aperture diaphragms made of 10 straight aperture blades that lead to very distinct sunstars at most aperture vales. Only at f\/4.5 and f\/22 the opening is mostly round, so no sunstars at these settings.<\/p>\n<figure id=\"attachment_53407\" aria-describedby=\"caption-attachment-53407\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53407\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_11_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_11_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_11_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_11_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53407\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<p>If you want to know more about sunstar rendering of different lenses have a look at <a href=\"https:\/\/phillipreeve.net\/blog\/best-lenses-for-sunstars\/\">this article<\/a>.<\/p>\n<h2>Chromatic aberration<\/h2>\n<h3><strong>lateral<\/strong><\/h3>\n<p>Lateral CA are really well corrected, so there is nothing I could show you here.<\/p>\n<div dir=\"auto\">\n<div dir=\"auto\">\n<h3><strong>longitudinal<\/strong><\/h3>\n<p>As the Zeiss ZM 21mm 4.5 is a slow wide angle lens longitudinal CA are nothing to worry about.<\/p>\n<\/div>\n<\/div>\n<div dir=\"auto\">\n<div dir=\"auto\">&nbsp;<\/div>\n<\/div>\n<div dir=\"auto\">\n<div dir=\"auto\">\n<h2>Conclusion<\/h2>\n<table>\n<tbody>\n<tr>\n<td><strong>good<\/strong><\/p>\n<ul>\n<li><span style=\"color: #339966;\">sharpness\/contrast<\/span><\/li>\n<li><span style=\"color: #339966;\">flare resistance<\/span><\/li>\n<li><span style=\"color: #339966;\">sunstars<\/span><\/li>\n<li><span style=\"color: #339966;\">distortion<\/span><\/li>\n<li><span style=\"color: #339966;\">build quality and handling<\/span><\/li>\n<li><span style=\"color: #339966;\">size\/weight<\/span><\/li>\n<\/ul>\n<\/td>\n<td><strong>average<\/strong><\/p>\n<ul>\n<li>coma correction<\/li>\n<\/ul>\n<\/td>\n<td><strong>not good<\/strong><\/p>\n<ul>\n<li><span style=\"color: #ff0000;\">high vignetting<\/span><\/li>\n<li><span style=\"color: #ff9900;\">color cast on digital M-mount cameras prior to M11<\/span><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>When it comes to fast portrait lenses &#8211; like the <a href=\"https:\/\/phillipreeve.net\/blog\/carl-zeiss-c-sonnar-t-50mm-f1-5-zm-a-detailed-review\/\">Zeiss ZM 50mm 1.5 C-Sonnar<\/a> &#8211; I think it makes some sense to re-release famous older designs &#8211; slightly improved &#8211; for their &#8220;signature&#8221; rendering.<\/p>\n<p>But when it comes to slow wide angle lenses, I am not so sure it makes a lot of sense to do that. With slow wide angle lenses like this one, usually everything is in focus anyway, there is not a lot to talk about in terms of rendering.<\/p>\n<p>Sharp across frame, good flare resistance, preferably low vignetting and maybe nice sunstars. These are the criteria most people care about in slow wide angle lenses, no matter if they are based on a modern or a vintage design.<\/p>\n<p>Now the good news are, this Zeiss ZM 21mm 4.5 shows a very good performance in most categories. It is even a bit sharper across frame stopped down than the VM 21mm 3.5 and by f\/8.0 most aberrations (except for vignetting) are not really something to worry about.<\/p>\n<p>The problem is, because of its vintage Biogon design, this lens doesn&#8217;t play very well with non-BSI digital sensors and these sensors can be found in all the digital Leica M cameras that came before the M11. As is also the case for e.g. the <a href=\"https:\/\/phillipreeve.net\/blog\/review-contax-g-16mm-8-0-hologon\/\">Zeiss 16mm 8.0 Hologon<\/a>, the <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-15mm-4-5-ii-super-wide-heliar\/\">Voigtl\u00e4nder 15mm 4.5 MKI\/II<\/a> or the <a href=\"https:\/\/phillipreeve.net\/blog\/review-zeiss-zm-18mm-4-0-distagon\/\">Zeiss ZM 18mm 4.0<\/a>, also this Zeiss ZM 21mm 4.5 therefore creates strong color cast on those M8, M9, 220\/240\/262 and M10 cameras.<\/p>\n<div dir=\"auto\">\n<p>As I have shown in this review, that color cast can be easily corrected, but this is still an extra step in post processing, which is simply not needed when using the newer <a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-3-5-color-skopar\/\">Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar<\/a>. So for everyone that does not want to complete his Zeiss ZM line-up &#8211; or is looking for a lens solely for B&amp;W or analogue shooting &#8211; the Voigtl\u00e4nder is most likely the smarter choice these days.<\/p>\n<p><em>The Zeiss ZM 21mm 4.5 has long been discontinued, it can sometimes be found on <a href=\"https:\/\/www.ebay.com\/sch\/i.html?_from=R40&amp;_trksid=p4432023.m570.l1313&amp;_nkw=zeiss+zm+21mm+4.5&amp;_sacat=0&amp;mkcid=1&amp;mkrid=711-53200-19255-0&amp;siteid=0&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.com<\/a> | <a href=\"https:\/\/www.ebay.de\/sch\/i.html?_from=R40&amp;_trksid=p4432023.m570.l1313&amp;_nkw=zeiss+zm+21mm+4.5&amp;_sacat=0&amp;mkcid=1&amp;mkrid=707-53477-19255-0&amp;siteid=77&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.de<\/a> for about <strong>$850<\/strong> (advertisement\/affiliate links)<\/em><\/p>\n<h2>Alternatives<\/h2>\n<p><a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-3-5-color-skopar\/\"><em><strong>Voigtl\u00e4nder VM 21mm 3.5 Color-Skopar:<\/strong><\/em><\/a><br \/>\nAs both lenses are made by Cosina, the Voigtl\u00e4nder VM 21mm 3.5 can be seen as the successor to this Zeiss ZM 21mm 4.5. The Voigtl\u00e4nder features an aspherical element and has been optimized for digital sensors, so it does not show that odd asymmetrical color cast on older digital Leica cameras. At infinity the Zeiss is a bit sharper across frame, the Voigtl\u00e4nder has slightly better flare resistance.<br \/>\n<em>buy from <a href=\"https:\/\/bhpho.to\/3e8CXjL\">B&amp;H<\/a> | <a href=\"https:\/\/amzn.to\/3nBjsn8\">amazon.com<\/a> | <a href=\"https:\/\/www.ebay.com\/sch\/i.html?_from=R40&amp;_trksid=m570.l1313&amp;_nkw=voigtlander+vm+21mm+3.5&amp;_sacat=0&amp;mkcid=1&amp;mkrid=711-53200-19255-0&amp;siteid=0&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.com<\/a> for about <strong>$799<\/strong> (advertisement\/affiliate links)<\/em><\/p>\n<p><em><strong>Voigtlander VM 21mm 4.0 Color-Skopar:<\/strong><\/em><br \/>\nThe predecessor to the aforementioned Voigtl\u00e4nder can be found for about half the price and it is also smaller and lighter. I have shortly used it and wasn&#8217;t too happy with it, it did not show as high contrast as either the newer 21mm 3.5 or this Zeiss and had issues with veiling flare. It also has even more severe issues with color cast on Leica&#8217;s older fullframe digital M cameras.<br \/>\n<em>buy from <a href=\"https:\/\/bhpho.to\/3udQQCZ\">B&amp;H<\/a> | <a href=\"https:\/\/ebay.us\/MRHT9L\">ebay.com<\/a> | <a href=\"https:\/\/ebay.us\/RZgO0K\">ebay.de<\/a> for <strong>$419<\/strong> (advertisement\/affiliate links)<\/em><\/p>\n<p><a href=\"https:\/\/phillipreeve.net\/blog\/review-voigtlander-vm-21mm-1-4-nokton\/\"><em><strong>Voigtlander VM 21mm 1.4 Nokton:<\/strong><\/em><\/a><br \/>\nThis 21mm 1.4 is Voigtlander&#8217;s faster 21mm option. It is a great performer stopped down but sadly the vignetting is really high at f\/1.4. Still, if you have need for a fast 21mm lens this one is surely worth a look, as it shows am amazing performance and thanks to a floating elements design does so at all focus distances.<br \/>\n<em>buy from <a href=\"https:\/\/bhpho.to\/3vJQpjZ\">B&amp;H<\/a> | <a href=\"https:\/\/www.ebay.com\/sch\/i.html?_from=R40&amp;_trksid=p2334524.m570.l1313&amp;_nkw=voigtlander+vm+21mm+1.4+&amp;_sacat=0&amp;LH_TitleDesc=0&amp;_osacat=0&amp;_odkw=Zeiss+ZM+21mm+4.5+Biogon&amp;mkcid=1&amp;mkrid=711-53200-19255-0&amp;siteid=0&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.com<\/a> | <a href=\"https:\/\/www.ebay.de\/sch\/i.html?_from=R40&amp;_trksid=m570.l1313&amp;_nkw=voigtlander+vm+21mm+1.4+&amp;_sacat=0&amp;LH_TitleDesc=0&amp;_osacat=0&amp;_odkw=Zeiss+ZM+21mm+4.5+Biogon&amp;mkcid=1&amp;mkrid=707-53477-19255-0&amp;siteid=77&amp;campid=5337820268&amp;toolid=20008&amp;mkevt=1\">ebay.de<\/a> for <strong>$1049<\/strong> (advertisement\/affiliate links)<\/em><\/p>\n<p><a href=\"https:\/\/phillipreeve.net\/blog\/review-ttartisan-21mm-1-5\/\"><em><strong>TTArtisan 21mm 1.5 Asph:<\/strong><\/em><\/a><br \/>\nThe cheapest fast 21mm M-mount lens option that unfortunately comes with quite a few optical compromises.<br \/>\n<em>buy from <a href=\"https:\/\/amzn.to\/2TPUeEK\">amazon.com<\/a> | <a href=\"https:\/\/www.ebay.com\/sch\/i.html?_from=R40&amp;_trksid=m570.l1313&amp;_nkw=ttartisan+21mm+1.5&amp;_sacat=0&amp;mkrid=711-53200-19255-0&amp;siteid=0&amp;mkcid=1&amp;campid=5337820268&amp;toolid=10001&amp;customid=&amp;mkevt=1\">ebay.com<\/a> | <a href=\"https:\/\/www.ebay.de\/sch\/i.html?_from=R40&amp;_trksid=m570.l1313&amp;_nkw=ttartisan+21mm+1.5&amp;_sacat=0&amp;mkrid=707-53477-19255-0&amp;siteid=77&amp;mkcid=1&amp;campid=5337820268&amp;toolid=10001&amp;customid=&amp;mkevt=1\">ebay.de<\/a> for <strong>$429<\/strong> (advertisement\/affiliate links)<\/em><\/p>\n<p><em><strong>Leica 21mm M-mount lenses:<\/strong><\/em><br \/>\nLeica currently offers a 21mm f\/1.4, 21mm f\/2.8 and 21mm f\/3.4 prime lens as well as a 16-18-21mm 4.0 zoom lens. Out of those I have only used the 16-18-21mm personally yet (and that one was more of a disappointment) and I am not too keen on trying the others, as they are all at least $3.000, for which I could buy the VM 21mm 1.4, VM 21mm 3.5 and this Zeiss 21mm 4.5.<\/p>\n<\/div>\n<div dir=\"auto\">\n<h2>Sample Images<\/h2>\n<div class=\"mceTemp\">&nbsp;<\/div>\n<figure id=\"attachment_53930\" aria-describedby=\"caption-attachment-53930\" style=\"width: 534px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53930\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_Mathew_2.jpg\" alt=\"\" width=\"534\" height=\"799\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_Mathew_2.jpg 534w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_Mathew_2-201x300.jpg 201w\" sizes=\"auto, (max-width: 534px) 100vw, 534px\" \/><figcaption id=\"caption-attachment-53930\" class=\"wp-caption-text\">Leica M262 | Zeiss ZM 21mm 4.5 | \u00a9Matthew<\/figcaption><\/figure>\n<figure id=\"attachment_53929\" aria-describedby=\"caption-attachment-53929\" style=\"width: 534px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53929\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_Mathew_1.jpg\" alt=\"\" width=\"534\" height=\"799\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_Mathew_1.jpg 534w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_Mathew_1-201x300.jpg 201w\" sizes=\"auto, (max-width: 534px) 100vw, 534px\" \/><figcaption id=\"caption-attachment-53929\" class=\"wp-caption-text\">Leica M4 | Zeiss ZM 21mm 4.5 | \u00a9Matthew<\/figcaption><\/figure>\n<figure id=\"attachment_53400\" aria-describedby=\"caption-attachment-53400\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53400\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_4_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_4_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_4_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_4_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53400\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53399\" aria-describedby=\"caption-attachment-53399\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53399\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_3_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_3_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_3_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_3_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53399\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53921\" aria-describedby=\"caption-attachment-53921\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53921\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_18_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_18_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_18_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_18_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53921\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<figure id=\"attachment_53923\" aria-describedby=\"caption-attachment-53923\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53923\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_20_M10_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_20_M10_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_20_M10_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_20_M10_4.5-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53923\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/4.5<\/figcaption><\/figure>\n<figure id=\"attachment_53924\" aria-describedby=\"caption-attachment-53924\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53924\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_21_M10_4.5.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_21_M10_4.5.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_21_M10_4.5-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_21_M10_4.5-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53924\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/4.5<\/figcaption><\/figure>\n<figure id=\"attachment_53406\" aria-describedby=\"caption-attachment-53406\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53406\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_10_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_10_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_10_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_10_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53406\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53405\" aria-describedby=\"caption-attachment-53405\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53405\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_9_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_9_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_9_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_9_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53405\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53402\" aria-describedby=\"caption-attachment-53402\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53402\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_6_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_6_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_6_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_6_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53402\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53403\" aria-describedby=\"caption-attachment-53403\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53403\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_7_M10_8.0.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_7_M10_8.0.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_7_M10_8.0-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_7_M10_8.0-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53403\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/8.0<\/figcaption><\/figure>\n<figure id=\"attachment_53679\" aria-describedby=\"caption-attachment-53679\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53679\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_15_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"461\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_15_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_15_M10_11-300x173.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_15_M10_11-768x443.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53679\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<figure id=\"attachment_53676\" aria-describedby=\"caption-attachment-53676\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-53676\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_12_M10_11.jpg\" alt=\"zeiss zm 21mm 4.5 c-biogon classic wide angle leica m10 m11 m9 m8 m10r review 42mp 24mp 61mp contrast sharpness bokeh vignetting\" width=\"800\" height=\"533\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_12_M10_11.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_12_M10_11-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2024\/04\/Zeiss_ZM_21mm_4.5_Sample_12_M10_11-768x512.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-53676\" class=\"wp-caption-text\">Leica M10 | Zeiss ZM 21mm 4.5 C-Biogon | f\/11<\/figcaption><\/figure>\n<p><em>Most of the sample images in this review can be found in full resolution <a href=\"https:\/\/flic.kr\/s\/aHBqjCkfwK\">here<\/a>.<\/em><\/p>\n<h2>Further Reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/lenses\/leica-lenses\/\">All M-mount Reviews<\/a><\/li>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/review-zeiss-zm-18mm-4-0-distagon\/\">Review: Zeiss ZM 18mm 4.0<\/a><\/li>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/rolling-review-zeiss-loxia-distagon-2-821mm-t\/\">Review: Zeiss Loxia 21mm 2.8<\/a><\/li>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/review-zeiss-zm-35mm-1-4-t-distagon\/\">Review: Zeiss ZM 35mm 1.4<\/a><\/li>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/rolling-review-zeiss-loxia-85mm-2-4\/\">Review: Zeiss Loxia 85mm 2.4<\/a><\/li>\n<\/ul>\n<h2>Support Us<\/h2>\n<p>Did you find this article useful or just liked reading it? Treat us to a coffee!<br \/>\n<a href=\"https:\/\/www.paypal.com\/donate\/?hosted_button_id=3K9EJRRQVXT4J\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-40345 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2023\/06\/donate2.png\" alt=\"\" width=\"103\" height=\"29\"><\/a><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.paypal.com\/en_SE\/i\/scr\/pixel.gif\" alt=\"\" width=\"1\" height=\"1\" border=\"0\"> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.paypal.com\/en_SE\/i\/scr\/pixel.gif\" alt=\"\" width=\"1\" height=\"1\" border=\"0\"><em>via Paypal<\/em><\/p>\n<p>This site contains advertisement\/affiliate links. If you make a purchase using any of the links marked as advertisement\/affiliate links, I may receive a small commission at no additional cost to you. This helps support the creation of future content.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Introduction The Zeiss ZM 21mm 4.5 C-Biogon is the widest of the three &#8220;Classic&#8221; designs in Zeiss&#8217; ZM line up. It has long been discontinued and it wasn&#8217;t in production for a long time, so it is a bit rare and rather expensive on the used market. I always wondered how it would compare to &hellip; <a href=\"https:\/\/phillipreeve.net\/blog\/review-zeiss-zm-21mm-4-5-c-biogon\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Review: Zeiss ZM 21mm 4.5 C-Biogon<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":4708,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[57,18,419,169],"tags":[],"class_list":["post-53319","post","type-post","status-publish","format-standard","hentry","category-leica-m","category-review","category-vintage","category-zeiss"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Review: Zeiss ZM 21mm 4.5 C-Biogon - phillipreeve.net<\/title>\n<meta name=\"description\" content=\"The Zeiss ZM 21mm 4.5 C-Biogon is a very compact wide angle lens for the Leica M-mount. 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