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The "Mamiya" SLR - the very first Mamiya Single Le
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PostPosted: Tue Jul 02, 2019 9:36 pm    Post subject: The "Mamiya" SLR - the very first Mamiya Single Le Reply with quote

Yesterday i got a sample of the the very first Mamiya SLR, simply called "Mamiya". There is very little information found on-line; it is said to be from 1960. The camera has an Exakta bayonet (with a Sekor F. C. 1.7/58mm lens attached). Its shutter goes from 1 s to 1/500 s, the aperture on the 58mm lens from f1.7 to f22.

My sample has a stuck shutter, and the lens aperture is stuck open as well. Obviously - long time ago - someone tried to fix it: A few "spare" parts such as small screws and other "minor" parts were glued onto the inside of the camera (where one would load the film)!

More images will follow.

Does someone know more about this beast?





Stephan


PostPosted: Tue Jul 02, 2019 9:52 pm    Post subject: Reply with quote

Cool find, I've never seen the camera.


PostPosted: Tue Jul 02, 2019 10:44 pm    Post subject: Reply with quote

You can see.

http://herron.50megs.com/prismat.htm


PostPosted: Sun Jul 07, 2019 8:27 pm    Post subject: Reply with quote

Here are two more images from the Mamiya SLR:




Stephan


PostPosted: Mon Jul 08, 2019 9:53 am    Post subject: Reply with quote

With an 58mm 1.7 6 element lens with good sharpness, 10 blades?. https://www.pentaxforums.com/userreviews/mamiya-sekor-58mm-f-1-7.html The last version of it was in 42mm mount for the Mamiya CWP/CP SLR model. I presume it is a double gauss but could not find a lens diagram. Mamiya had odd optical schemes in some early rangefinder models but probably not in the early SLRs.

Ernst Dinkla


PostPosted: Mon Jul 08, 2019 6:35 pm    Post subject: Reply with quote

Ernst Dinkla wrote:
With an 58mm 1.7 6 element lens with good sharpness, 10 blades?. https://www.pentaxforums.com/userreviews/mamiya-sekor-58mm-f-1-7.html The last version of it was in 42mm mount for the Mamiya CWP/CP SLR model. I presume it is a double gauss but could not find a lens diagram. Mamiya had odd optical schemes in some early rangefinder models but probably not in the early SLRs.
Ernst Dinkla


Before being able to test it, i had to slightly adjust infinity. Comparing the Mamiya side-by-side with the last computation of the Topcor RE 1.8/58mm (certainly one of the better normal lenses from that time) the Mamiya has as little CAs, but slightly more astigmatism. It seems the Mamiya has a thoriated front lens which is rather unusual.

Stephan

EDIT my Mamyia Sekor F.C. 1.7/58mm has seven aperture blades. Obviously one is missing, so the correct number would be eight blades!


PostPosted: Mon Jul 15, 2019 10:10 pm    Post subject: Reply with quote

Mamiya made some of the early Canon cameras. A good pedigree


PostPosted: Tue Jul 16, 2019 11:40 am    Post subject: Reply with quote

philslizzy wrote:
Mamiya made some of the early Canon cameras. A good pedigree


Are you sure? I only know of some Nikon and, maybe, Ricoh SLRs made by Mamiya, namely the Nikkorex F:
https://www.cameraquest.com/nfrex.htm

Some of the later Mamyia Prismat SLRs were equipped with Canon lenses, however.

Stephan