Please help me identify this mount

Started 2 months ago | Questions thread
ProfHankD Veteran Member • Posts: 6,697

John Michael Winterbourne wrote:

I suspect that your lens has a "YS" mount, in M42.

Way back, SP often meant "Screw-thread for Pentax" (which is M42) -- as opposed to the later K bayonet for Pentax cameras, which tended to abbreviate as PK. The SP abbreviation seems a bit strained until you realize the Pentax's dominant series of screw thread bodies were SPotmatics....

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