How to use your Mamiya ZE mount lens on a Pentax K camera body?

Pentax K body + Mamiya ZE lens

PARTIALLY COMPATIBLE

In theory, the 45.56mm flange focal depth of the Pentax K body would allow mounting Mamiya ZE lenses with a flange focal depth of 45.5mm, but seemingly, there are no simple (0.04mm) adapter rings for them. The possible reason might be that it's simply too thin for a stable mount, additionally, the diaphragm's adjusting lever must be operated externally (only that allows gradual aperture setting), and this doesn't fit the available dimensions.

That's the reason why the only adapters available are wider than should be in theory, and use an additional lens to make up for the "unnecessary" thickness:

The Mamiya ZE was introduced in 1980, as a very promising small film system, but unfortunately it has met an early fate. Find out more in this article.

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Terminology

In terms of compatibility, we distinguish four separate categories:

COMPATIBLE

PARTIALLY COMPATIBLE

COMPATIBLE IN THEORY

NOT COMPATIBLE

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:

MAC

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.