Identifying a lens mount (OLD version)

PLEASE NOTE!
The bookmark or link you have used links to an old (pre-2022 version) of this guide.
The new version is available here.


Comments

  1. Nice work, very helpful. With the SMC TAKUMAR you left out one of the items. There is another pin, the square extension. It serves to compensate for small tolerances in the screw mount and for how loosely or tightly you screw the lens onto the camera. The whole aperture simulator is not fixed in the lens mount, but can rotate. The square extension serves as a kind of index to make sure the camera receives the correct aperture setting. Not all SMC lenses have light meter coupling pins and there are even Super-Takumar lenses that do have them.

    1. Thank you very much Gerjan. That’s what you get from not having a Pentax M42 camera on hand. I hope you don’t mind if I mention your name when I get to updating the text?

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