Yashica T3 Zeiss 35mm f 2.8 to M39 Conversion

thingiverse

I've had this broken Yashica for some time and now that I have access to a 3D printer and Fusion 360 software, I was able to successfully complete this conversion. The focus helicoid is a simple M25 thread and it was inspired by early Leica models such as Elmar and also MS-Optical super pancake lenses. For now, due to limitations of skill, parts, and money, there are no rangefinder coupling or variable aperture control. The lens can work with digital mirrorless but I'm not sure if it will be safe to use with crop sensor cameras since there is a fixed rear element that goes inside the camera body. It works fine on my Sony A7. Dealing with 3D printed threads may be difficult, but with a fairly calibrated machine and some patience for extra scraping and cleaning, it will function just fine. * Print on PLA or PETG with 0.1 to 1.6 layer height for precision. * There are two pieces for the front lens group; one will be wide open at f2.8 (only recommended if using on digital) and one with a fixed aperture around F4. * You will need to set the focus before fixing the FOCUS_RING, you can do that with digital or some tracing paper as ground glass. * Use a small drill or a hot wire to make the holes for the screws. * Put just a drop of glue on the parts. Tested with digital and also on my Leica IIIf + Foma 100 and the images are pretty sharp. If this was helpful, consider making a donation of any amount. https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=BP8YS4BFBT8F6&currency_code=USD&source=url