by Jakub

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This is the first, "zebra" version, optically the same design as Pancolar 2.0/50. The aperture control switch ("tumbler") should have 2 positions, "A" is counter-clockwise when looking at the front element, "M" is clockwise when looking at the front element - not 3 positions. The rear part of the lens should have an actuator pin that, when pressed, makes the ...


This isn't a definative answer, but a speculation and something for you to check that's too long for a comment. I'd be surprised if the lever had a visible effect. Try turning the focus and f-stop rings at the different positions and see if there is a difference in feel or motion range. I have a pre-war Carl Zeiss Jena 50mm lens that has a separate ring ...

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