I use the K&F Concept adapter to mount Pentax K lenses on the Sony a7c. It's not bad, but it has two drawbacks: self-disassembling construction (I tightened the connection screws several times) and a mounted lens is rotated relative to the camera (but very small).
But I also have a [Chinese] noname Pentax K (A) - Sony NEX adapter as a spare:
Unlike other nonames, this adapter has aperture control (important to me):
Unlike the K&F Concept adapter, the lens is positioned without rotation relative to the camera. This is a good thing.
The aperture control ring is clickless. Sometimes that's good, but I'm not used to it.
But I noticed two bad things.
First, the aperture control has too short a travel:
As a result, you can't close the aperture to f/22 or even f/16 with many lenses. Yes, with full-frame digital cameras this is very rarely necessary (because of diffraction), but still.
Compare the maximum travel with the K&F Concept:
And with the Samsung MA9NXK adapter (for NX cameras):
Second, the adapter is too thick. I think it's 0.1mm thicker than it needs to be. This is really bad. It is impossible to focus to infinity with the adapter.
That's why I don't use this adapter.
See also related notes:
- K&F Concept: Адаптер Pentax K (DA) - Sony FE/E (2022-03-28)
- Samsung NX10: переходники на Pentax K и M42x1 (2010-11-13)
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