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04-06-2016, 04:52 AM   #16
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Join Date: Aug 2010
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Absolutely not a Pentax mount. The red dot and latch groove are in the wrong orientation in the rear view above. Looks more like the reverse-twist of a Nikon, although older Nikon lenses almost always have that little slit tab at the top that originally caught on the pin of a "Photomic" metering pentaprism for the F, F2, etc. I don't know how the registration dot and latch groove are set up on Olympus, Minolta or some of the old mounts such as Konica and the late model Topcons.

04-06-2016, 07:52 AM   #17
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Join Date: Mar 2015
Posts: 323
That is definitely a Nikon mount.
The little "scoop" in the mount near the locking groove gives it away as an Ai-S type mount - for Nikon post 1982, but pre-AF.

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