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Canon EF body + Pentax PK lens


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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In terms of compatibility, we distinguish four separate categories:

This means that you'll be able to apply the lens on the camera in question with a proper adapter, and full focus range will be available with it (often with aperture control too). If AF is supported, you'll see it in the description.
This means that due to the flange focal depth or other factor this conversion would be normally unfeasible, but with some compromises (e.g. using a speedbooster adapter) can be made possible.
This means that the flange focal depth should make mounting and using inifinty focus possible, but for some reason there are no adapter rings available or other factors make it unviable.
This means that you won't be able to mount your lens due to mechanical incompatibility or the difference in flange focal depth doesn't make inifinity focus possible. Although numerous lenses can be mounted on cameras without infinity focus, but this cannot be considered actual compatibility.

Additional information for compatible variations:

manual focus (on the lens, with its own control ring)
autofocus available (AF controlled by the camera body)
manual aperture control (on the lens, with its own control ring)
automatic aperture control (controlled by the camera body)
speedbooster (focal reducer) adapters are available
macro (variable length) adapters are available
tilt-shift (or other flexible) adapters can be used

If you'd like to read more in-depth about compatiblity, you'll need to get familiar with flange focal depth, see this article.