{"id":14305,"date":"2018-07-06T17:54:18","date_gmt":"2018-07-06T16:54:18","guid":{"rendered":"https:\/\/phillipreeve.net\/blog\/?p=14305"},"modified":"2023-06-20T13:29:55","modified_gmt":"2023-06-20T12:29:55","slug":"how-to-check-how-decentered-your-lens-is","status":"publish","type":"post","link":"https:\/\/phillipreeve.net\/blog\/how-to-check-how-decentered-your-lens-is\/","title":{"rendered":"How to check how decentered your lens is"},"content":{"rendered":"<h1>How to check if your lens is decentered?<\/h1>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-14310\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_221001.jpg\" alt=\"check lens decentering centered centering well bad sample variation\" width=\"1153\" height=\"395\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_221001.jpg 1153w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_221001-300x103.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_221001-768x263.jpg 768w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_221001-800x274.jpg 800w\" sizes=\"auto, (max-width: 1153px) 100vw, 1153px\" \/><\/p>\n<p>You may have already heard of sample variation or decentered lenses. In this article we will show you how to easily test your lenses for proper centering. If you know how it works it will take you less than 5 minutes per lens!<\/p>\n<p><!--more--><\/p>\n<h1>Where this test originates from<\/h1>\n<p>This test was published by the German <a href=\"http:\/\/www.gletscherbruch.de\/foto\/test\/dezentrierung\/dezentrierung.html\">Gletscherbruch homepage<\/a>, but as this website is only available in German we decided to write an English version.<\/p>\n<h1>How does it work?<\/h1>\n<h3>What you will need:<\/h3>\n<ul>\n<li>Tripod<\/li>\n<li>Some building far away (chimney, antenna, church tower etc.)<\/li>\n<\/ul>\n<h3>How to set your camera:<\/h3>\n<ul>\n<li>use the widest aperture of your lens (some lenses have very bad corner performance, stop these down until there is visible detail in the corners).<\/li>\n<li>manual focus<\/li>\n<li>manual exposure (or use AEL toggle)<\/li>\n<li>IBIS\/OSS off<\/li>\n<li>electronic first curtain shutter off (if you have a stable tripod)<\/li>\n<\/ul>\n<h3>What to do:<\/h3>\n<ol>\n<li>You set up your camera on the tripod.<\/li>\n<li>You put your target in the center of the frame and you focus on it.\n<p><figure id=\"attachment_14364\" aria-describedby=\"caption-attachment-14364\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14364 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00004-1.jpg\" alt=\"\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00004-1.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00004-1-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00004-1-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-14364\" class=\"wp-caption-text\">Focus is on the chimney in the center of the frame<\/figcaption><\/figure><\/li>\n<li>Do not change focus!<\/li>\n<li>Move your camera on the ballhead until your target is in one of the extreme corners of the frame and take the shot\n<p><figure id=\"attachment_14365\" aria-describedby=\"caption-attachment-14365\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14365 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00005-1.jpg\" alt=\"\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00005-1.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00005-1-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00005-1-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-14365\" class=\"wp-caption-text\">Chimney in upper left corner<\/figcaption><\/figure><\/li>\n<li>Repeat step 4 for the other 3 corners.\n<figure id=\"attachment_14366\" aria-describedby=\"caption-attachment-14366\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14366 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00006.jpg\" alt=\"\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00006.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00006-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00006-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-14366\" class=\"wp-caption-text\">Chimney in upper right corner<\/figcaption><\/figure>\n<figure id=\"attachment_14367\" aria-describedby=\"caption-attachment-14367\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14367 size-full\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00007-1.jpg\" alt=\"\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00007-1.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00007-1-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00007-1-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-14367\" class=\"wp-caption-text\">Chimney in lower left corner<\/figcaption><\/figure>\n<p><figure id=\"attachment_14368\" aria-describedby=\"caption-attachment-14368\" style=\"width: 800px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-14368\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00008.jpg\" alt=\"\" width=\"800\" height=\"534\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00008.jpg 800w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00008-300x200.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/DSC00008-768x513.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-14368\" class=\"wp-caption-text\">Chimney in lower right corner<\/figcaption><\/figure><\/li>\n<\/ol>\n<h1>How to rate your shots:<\/h1>\n<p>Before you rate your shots there are a few things to consider:<\/p>\n<ul>\n<li><strong>This is the most important one:<\/strong> do <strong>not<\/strong> send us your shots and ask if we think your lens is okay. We are neither your free-lens-checking-service nor your lens manufacturer&#8217;s quality assurance team. You check for yourself to see if you are okay with it and not to see what we think. Seriously don&#8217;t send them to us.<\/li>\n<li>A perfectly centered lens does not exist and a very slight decentering you will only rarely if ever notice in your pictures.<\/li>\n<li>There is no objective standard. You will have to decide if what you see is an issue for you or not and if you can expect to find a better copy.<\/li>\n<li>Every manufacturer ships decentered lenses, but some are worse than others. Zeiss for example\u00a0has significantly better quality control than Sony, but no manufacturer is perfect.<\/li>\n<li>Usually fast and wide lenses are more prone to decentering.<\/li>\n<li>Zooms are more prone to decentering, compared to primes you should lower your standard a bit.<\/li>\n<li>When testing zooms for decentering you should do it at the extremes and in the middle.<\/li>\n<li>If your lens has field curvature the corners will look worse than the center. To check centering you need to compare the corners to each other, not compare the corners to the center.<\/li>\n<\/ul>\n<h3>The &#8220;perfect&#8221; lens<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-14306\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205132.jpg\" alt=\"check lens decentering centered centering well bad sample variation\" width=\"800\" height=\"454\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205132.jpg 1020w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205132-300x170.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205132-768x436.jpg 768w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205132-800x454.jpg 800w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>This is pretty much as good as it gets, there is almost no variation. You just won the lottery.<\/p>\n<h3>The &#8220;almost perfect&#8221; lens<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-14309\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_210029.jpg\" alt=\"check lens decentering centered centering well bad sample variation\" width=\"800\" height=\"213\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_210029.jpg 1152w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_210029-300x80.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_210029-768x204.jpg 768w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_210029-800x213.jpg 800w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>One corner is very slightly worse, but this will be pretty much unnoticeable. This is a perfectly usable lens.<\/p>\n<h3>The decentered lens<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-14308\" src=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205633.jpg\" alt=\"check lens decentering centered centering well bad sample variation\" width=\"1019\" height=\"578\" srcset=\"https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205633.jpg 1019w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205633-300x170.jpg 300w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205633-768x436.jpg 768w, https:\/\/phillipreeve.net\/blog\/wp-content\/uploads\/2018\/06\/2018-06-15_205633-800x454.jpg 800w\" sizes=\"auto, (max-width: 1019px) 100vw, 1019px\" \/><\/p>\n<p>This one is badly decentered in a way that it might actually have a visible influence on your results. You might want to consider returning this or have it serviced.<\/p>\n<p>We can also highly recommend Roger Cicala&#8217;s article on <a href=\"https:\/\/www.lensrentals.com\/blog\/2016\/02\/optical-quality-assurance\/\">optical quality assurance<\/a>. It is a more complicated business than you might have guessed.<\/p>\n<h1>Further Reading<\/h1>\n<ul>\n<li><a href=\"http:\/\/phillipreeve.net\/blog\/review-leica-90mm-2-0-summicron-m\/\">Leica Summicron 90mm 2.0 pre Asph Review<\/a><\/li>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/wideangle-lenses-for-the-sony-alpha-7-series\/\">Wide angle lenses for A7 series cameras<\/a><\/li>\n<li><a href=\"https:\/\/phillipreeve.net\/blog\/mini-tripods-for-mirrorless-cameras\/\">Mini tripods for mirrorless cameras<\/a><\/li>\n<\/ul>\n<h1>Support Us<\/h1>\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\" \/> <span style=\"color: #999999;\"><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><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to check if your lens is decentered? You may have already heard of sample variation or decentered lenses. In this article we will show you how to easily test your lenses for proper centering. If you know how it works it will take you less than 5 minutes per lens!<\/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":[1],"tags":[],"class_list":["post-14305","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to check how decentered your lens is - phillipreeve.net<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/phillipreeve.net\/blog\/how-to-check-how-decentered-your-lens-is\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to check how decentered your lens is - phillipreeve.net\" \/>\n<meta property=\"og:description\" content=\"How to check if your lens is decentered? 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Don't ask me anything about macro or wildlife shooting though.","sameAs":["https:\/\/www.flickr.com\/bastian_k","https:\/\/www.facebook.com\/bastian.kratzke","https:\/\/www.instagram.com\/bastiankratzke","https:\/\/www.linkedin.com\/in\/bastian-kratzke-450636164\/"],"url":"https:\/\/phillipreeve.net\/blog\/author\/bastiank\/"}]}},"_links":{"self":[{"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/posts\/14305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/users\/4708"}],"replies":[{"embeddable":true,"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/comments?post=14305"}],"version-history":[{"count":9,"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/posts\/14305\/revisions"}],"predecessor-version":[{"id":41523,"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/posts\/14305\/revisions\/41523"}],"wp:attachment":[{"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/media?parent=14305"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/categories?post=14305"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/phillipreeve.net\/blog\/wp-json\/wp\/v2\/tags?post=14305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}