The Helios 44K-4 is a K-mount lens (I own it).
There is no part I would call "aperture pin".
If you are speaking about the item moving in a quarter circle when moving the aperture ring: this coupling is not used by Pentax DSLRs and late Pentax film bodies. And it is indeed quite "stiff". It is NOT moved by body mechanics, it just signals to the body which aperture was set.
That's why cameras not supporting aperture coupling - like all Pentax DSLRs - need stop down metering with such lenses.
Or is it not a Helios 44"K"-4?
The "M" types are M42 lenses..
Last edited by RKKS08; 01-01-2015 at 03:58 PM.
Reason: Added info
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