FINALLY go to test my 50/2 Jupiter-8 (post-war Soviet copy of the Zeiss Sonar 50/2). Rather sharp in the center, not so much in the corners, so they say. They didn't have click-stops for aperture, so it's very weird. Focus is a little stiff on the long side.
Using the lens is tricky until you get used to it. The "mark" for focus/aperture is on the side (90* from the top) when using an adapter.
I also have an Industar-61 53/2.8, one of the most highly regarded of the Soviet lenses, they say. Haven't tested that one out yet.
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Life's better on the Mountain.
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