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10-31-2011, 02:00 PM   #1
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Join Date: Feb 2011
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AM Topcor MC 135mm f/2.8

From what little I could find online I can only conclude that it's not very common. It's a PK mount, has a built-in hood, and I think a 55mm thread. Found a lot of info on the Topcor 135mm f/3.5 model but next to nothing on this f/2.8. Haven't really taken any pictures with it yet; waiting for good weather. Probably spring.

Does anyone have anything on this lens? It's not on the lens database here.

Click to enlarge photos.

10-31-2011, 02:58 PM   #2
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
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Looks a lot like the M42 mount Rikenon that I bought. No half stops, short built in hood and 6 blade aperture that collapses to a triangle. Serious internal reflections off the rear lens group mounting that w solved with some flat black paint.
04-03-2017, 01:42 PM   #3
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Made by Cima Kogaku, who by that time was a subsidiary of Tokyo Kogaku (Topcon). Cima Kogaku had a system where they could screw on many different mounts onto the same lenses. US Patent 4,174,167.

They also sold this lens themselves under "Cimko MT" branding, and it was house-branded by many customers.

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