Pentax K to Canon EOS EF lens adapter

thingiverse

I made some modifications to the adapter designed by IceBeem because both the adapter and the lens were loose when I used my Ricoh lens, which has a Pentax K mount, on my 5D mk II. I created a notch for the Canon locking mechanism that's a bit smaller and thickened parts of the adapter in certain areas to achieve a tighter fit. Now, I do get infinity focus with my Ricoh 50mm 1.7 lens. When printing, use a resolution of at least 0.12; otherwise, you may not achieve infinity focus. Important note: If you're using a full-frame Canon camera, remove the protruding part on the back of the lens to prevent the mirror from colliding with it! (Check out my photo showing this part removed.) This is not a concern for cameras with crop sensors, as their mirrors are smaller.