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Forum: Pentax SLR Lens Discussion
06-19-2017, 02:54 AM
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Some people suggested that Cosina has licensed the design and made it themselves. My Porst version (Non MC has a metal focus ring with straight metal knurls). Has a name ring that looks very Cosina.
It definitely has the flat back element (which causes reflections on the sensor when stopped down).
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Forum: Pentax SLR Lens Discussion
07-04-2016, 03:14 AM
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The flickr group about this lens is also screaming Tomioka at me. I have a Porst variant. But there are also Rikenon, Revuenon, Chinon's out there, and probably more as Tomioka made lenses for a lot's of companies. It is pretty soft wide open.
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Forum: Pentax SLR Lens Discussion
07-03-2016, 02:47 PM
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