Canon EF body + Pentax PK lens
COMPATIBLE MF MA
The two systems can be easily brought together.
You'll need a 1.46mm thick adapter ring (the difference in flange focal depth) when converting PK lenses to Canon EF cameras. The lens is fixed by a small metal bit that can be pressed in only whe the lens (along with the adapter) is removed from the Canon body.
Find your adapter here:
There's an important matter concerning compatibility: lenses with PK bayonet locks have small lugs and their cover that reach well over the end of the adapter (this was responsible for aperture control on original PK cameras). With smaller mirrors (e.g. Canons with APS-C sensor) it isn't really an issue, but on fullframe EOS cameras it can interfere with the mirror (and other parts). Therefore if you'd like to use them on a fullframe EF camera, you'll have to remove these lugs.
This adapter type has chipped versions too, which provide digital focus confirmation for the camera. If you'd like to read more about the limitations of adapter chips, this article can help you.
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