Contax/Yashica to Canon RF Adapter (With locking mechanism)
thingiverse
With this adapter you can use C/Y lenses on a mirrorless Canon RF camera. It has a basic locking mechanism, and should allow focusing to infinity. - I recommend printing it upside down, with the RF mount facing up, without a support structure. - The C/Y Lens will be locked into place by a small spring lever, that you need to hold down from the inside to remove the lens (ideally when putting it on too). The lever is also not super strong, so be sure not so apply too much pressure counter-clockwise. Blender file included.
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