Canon EF-M to M39 / L39 Adapter

thingiverse

I had an old Russian camera with a M39 lens and recently acquired a Canon M50, so I decided to use the old lens on my new camera for some fun. Since EF-M mount is not widely used, there were no available adapters, so I made my own using two community-made adapters (links included). The adapter is functional, though it's far from perfect. First and foremost, it looks quite ugly. Perhaps I'll re-print it in gold to give it a more luxurious appearance. More importantly, the EF-M mount is surprisingly loose, so I used 4 layers of 3M duct tape - any brand will suffice, but for this particular application, 4 layers are perfect as I discovered after trying both 3 and 5 layers (see last photo). The added flange distance is also a significant issue, resulting in limited focus capabilities. Despite these drawbacks, I'm pleased with how the adapter turned out. It's a great starting point that can be refined further. Edit 2020-01-05: I updated the STL file to correct the flange distance issue. However, I haven't had a chance to test it yet. Edit 2020-01-12: Plans are underway to create a tilt-shift version of this adapter. Stay tuned for updates!