An SLR lens with a very strange mount: help identify?

David Lyga · Jul 1, 2016

Sankyo Koki Tokyo Komura, 3.5/135mm, very heavy. What is it for?

btaylor · Jul 1, 2016

Looks like a Nikon S or Contax rangefinder mount to me.

dynachrome · Jul 1, 2016

I was about to say that based on the silver tab it looks like an RF lens. It could also be that some part of the rear of the mount is missing.

onre · Jul 1, 2016

Contax external bayonet mount, I think.

Richard S. (rich815) · Jul 1, 2016

btaylor said:
Looks like a Nikon S or Contax rangefinder mount to me.

Yup. Here is the mount of my Carl Zeiss Jena 13,5cm/4 Sonnar that mounts my Contax IIIa. Seems a match to me.

Fixcinater · Jul 1, 2016

You can see an upside down N stamped just above the word JAPAN in the first image.

Hence, Nikon calibrated S mount. If there was a C, it would be Contax RF.

Should be a very nice lens.

Richard S. (rich815) · Jul 1, 2016

Fixcinater said:
You can see an upside down N stamped just above the word JAPAN in the first image.

Hence, Nikon calibrated S mount. If there was a C, it would be Contax RF.

Should be a very nice lens.

Ah, good point Fixinater. While most wide lenses can be used and mounted on either Nikon RF or Contax RF body (at least with acceptable/semi-acceptable results if stopped down at least 1-2 stops) the normal to tele lenses are best used as to which its calibrated for. Forgot about that.

David Lyga · Jul 2, 2016

Thank you rich815 for identifying this. Your photo is identical to what I have. - David Lyga

Richard S. (rich815) · Jul 2, 2016

David Lyga said:
Thank you rich815 for identifying this. Your photo is identical to what I have. - David Lyga

Yes, but be sure not to miss Fixcinater's post above. Contax RF and Nikon RF had in essence identical mounts but differences which are important for normal-tele lenses. You have a Nikon RF lens, not a Contax RF one.

David Lyga · Jul 2, 2016

Thank you, rich815, however I don't even have a camera to mount it on. - David Lyga

An SLR lens with a very strange mount: help identify?

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