Sony E body + Pentax PK lens
COMPATIBLE MF MA SB TS
PK lenses can be easily adapted to Sony E cameras.
The difference between flange focal depths is 27.46 mm. This is more than enough for the aperture release lever of the PK, which means you won't have to DIY anything. The locking lug can be found on the adapter, it can be easily released with a small button.
Another available version is the PK-NEX tilt-shift adapter, compatible with all PK lenses. You can find them here:
Last, but not least speedbooster adapters are also available. The adapter shrinks the projected image of the fullframe PK to fit the APS-C sensor NEX cameras (A6000, A6300, A6500):
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