Aptly dubbed the “Crapinon,” the lens is literally garbage — which both refers to how it was made and the fact that it is really not sharp at all. However, we can’t help but be impressed with the results, soft as they are. The photos have a very retro, film aesthetic, with subdued contrast and colors. It’s a look that will undoubtedly help propel your Instagram account to unimaginable new heights.
Stern built the lens to work on a full-frame camera. He arrived at the focal length of 135mm after some experimentation. As for the aperture, which is fixed without a mechanical iris diaphragm, he believes it is between f/2 and f/3, according to DIYPhotography. Based on the very shallow depth of field of the sample photos, that would seem to make sense.
Of course, actually being able to reproduce Stern’s Crapinon may not be quite so easy as he makes it seem. For one, most of us likely don’t have M42 tubes and focusing helicoids just lying around. Rummaging through flea markets also isn’t guaranteed to turn up a suitable optic. Still, it is good to know that if you happen upon one and if you have access to the associated required parts, a little elbow grease and trial and error will let you turn it into a surprisingly usable lens for your mirrorless camera or DSLR.