The Pentax SMC 4/100 Macro is a small and affordable macro lens from the 70’s. In this review I check if it can still deliver on today’s 24 Megapixel Sony a7.
Filter Thread: 55mm
Max. Magnification : 1:2
Close Focusing Distance (from the sensor/from the front of the lens): 45cm /27cm
Number of aperture blades: 6
Elements/ Groups: 5/4
i want to thank Marc for borrowing me the lens to write this review!
Image Samples in low resolution
Despite it’s age of more than 45 years the Minolta MC 2.5/100 is a very good lens with great built quality and bokeh for a very affordable price.
This blog is mostly about manual lenses which are usually 30 to 50 years old. And while most of them are surprisingly reliable the are a few things you should check before or after buying a lens.
This checklist is based on the experience I gained from buying more than a hundred lenses since I discovered how much fun it is to use them on Sony’s Alpha cameras.
If you have additional info about a defect not listed or disagree with my assessment please leave a comment!
Scratches on the lenses
Use a large light source like a window and place the lens between you and the light so that you can see the colorful coating of the lens.
Scratches are seldom a problem in the real world but they lower the resale value of a lens. In theory they could reduce the contrast of a lens or cause some flare but I have never seen that happen.
You can’t really do anything to restore coatings but it sometimes makes sense to fill larger scratches with black paint to avoid light scattering.