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| SMC Pentax-M 50mm f/1.4 converted and mounted on a Nikkormat FTn |
Founded in 1919 making lenses, but changed its name in 1938 to "Asahi Optical Co.", which would be in use until officially changing its company name to Pentax in 2002. They originally used M42 mount for their lenses, then the Pentax K mount was introduced in 1975.
SMC Pentax-M 50mm f/1.4 (Converted to Nikon Mount)
