CV 35 2.5 pancake II and M9

[KCS]

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When using a non-Leica lens that does not appear in the 'manual' lens list and is not coded, what is the best thing to do? Choose the closest option in the manual list e.g., set manual lens detection for a 35 f2? Something else?

 

Karen

[lars_bergquist]

I did that and it worked out well. The specimen I bought exhibited some pretty strong decentering however, and I have dumped it, but that is a different matter.

 

The old man from the Age of the v.4 Summicron

[KCS]

Thanks Lars. By decentering do you mean focus shift? or lack of sharpness? The reviews of the lens have been generally good, but I've never been happy with it on my M6--just doesn't seem sharp at any aperture (though I'm comparing it to a *really* great 50 'cron that I have). I'm going to take advantage of digital to experiment a bunch with it and then decide whether to keep it or stick with 50mm until I can recover from the M9 purchase enough to get a better lens.

 

Karen

[Bo_Lorentzen]

Hmm, I coded mine as the nearest performance wise which seemed to be a 35mm summarit 2.8 - Am very happy with how this lens render, I would venture to say that my particular example is the sharpest non Leica 35mm I have played with in this range, but being a CV there seems to be quite a lot of latitude in the QA.

 

 

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[Alnitak]

Thanks Lars. By decentering do you mean focus shift? or lack of sharpness? The reviews of the lens have been generally good, but I've never been happy with it on my M6--just doesn't seem sharp at any aperture (though I'm comparing it to a *really* great 50 'cron that I have). I'm going to take advantage of digital to experiment a bunch with it and then decide whether to keep it or stick with 50mm until I can recover from the M9 purchase enough to get a better lens.

 

Karen

 

Decentering occurs when one of the lens elements is not perfectly aligned along the optical axis. The typical result will be that one side or part of the image will be soft while the other parts are just fine. It seems to be a particularly common problem with the CV lenses. That said, the bulk of the CV lenses are just fine, and are extremely well made mechanically and optically.

 

Jeff