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XR Rikenon vs Yashica ML 50mm f2
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PostPosted: Thu Mar 23, 2023 8:13 pm    Post subject: Reply with quote
The m42 is a Cosina made lens. The K-mount as well but bespoke for Ricoh. Optically probably different.


PostPosted: Thu Mar 23, 2023 8:23 pm    Post subject: Reply with quote
This is the one I have. I wonder if it's a rebadged Pentax-M?
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PostPosted: Thu Mar 23, 2023 8:47 pm    Post subject: https://www.pentaxforums.com/lensreviews/data/27/large/smc_P Reply with quote
That seems to be the same as the Rikenon P 50mm 1:2, but without automatic aperture control pin. The Pentax-m 1:2 is 1mm longer and focusses to .45m instead of .6 Only the xr Rikenon 28mm 1:3.5 was a rebadge from Pentax. The Pentax-m 28/3.5 https://filmphotograph.com/ricoh-xr-rikenon-vs-smc-pentax-m-35mm


This is the rear of the Pentax-m 50mm 1:2


Bokeh between the Pentax and Ricoh is very similar though fuzzy highlights no sharp edges. May share a similar formula

Take out the front and rear element to see if they are flat on the inside.


PostPosted: Thu Mar 23, 2023 10:11 pm    Post subject: Reply with quote
Rikenons have always been very uncommon here, so never seen many in the wold to compare to the Pentaxes. Apart from the 50 and 55mm 'normals' the other Rikenons are just so rarely seen.


PostPosted: Thu Mar 23, 2023 10:47 pm    Post subject: Reply with quote
Apart from 50/55 I have a 135mm 2.8 and 75-150mm zoom. Pentaxforums probably has the most comprehensive list of Rikenons (much more than Allphotolenses)

https://www.pentaxforums.com/userreviews/showcat.php?mcats=&si=rikenon&what=title&name=&when=&whenterm=&dist=&radius=


PostPosted: Thu Mar 23, 2023 11:40 pm    Post subject: Reply with quote
I have this 2/50, the rare 3.5/28 Aspherical and the Rikenon P Zoom 35-70mm F3.4-4.5 which is a tiny thing and I suspect made by someone like Sigma.
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