The Pentacon 30/3.5 has M42x1 mount, but mounting it on a Pentax K camera with a standard adapter is problematic.
This lens has a very narrow flange that touches the adapter only.
The lens on the adapter does not rest on the K-mount flange of a camera. This causes play (backlash) of the lens on the camera.
I encountered this when trying to use the Pentacon 30/3.5 on a Samsung NX camera. I didn't have any M42x1 to NX adapters left, so I combined M42x1-K and K-NX adapters. Because of the lens play, it was noticeable that the focus plane moved. This may be the reason for the complaints about the image quality of the Pentacon 30/3.5 on Pentax cameras.
Of course, it is possible to use the Pentacon 30/3.5 with a flanged Pentax K adapter, but it won't focus to infinity.
See also related notes:
- Pentacon 30/3.5 (M42x1) (2023-05-01)
- Использование M42x1 на Pentax K (2016-06-22)
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