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Pentax K body + Pentax K lens


Simply wow!

The originally analog SLR Pentax-K system was the next generation after the popular M42 system, and the similarity in their flange focal depth isn't a coincidence either. More recent PK bayonet locks are AF compatible.

For a long time after the dawn of the digital era, only APS-C sensors were used in PK lock cameras, but in 2015 the Pentax K-1 was introduced, which is outfitted with a fullframe sensor.

One of the best features of the digital PK systems that they can use the older PK lens types without any converters, and a simple recessed ring adapter will allow mounting M42 lenses as well.

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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.