Please help me identify this mount

Started 2 months ago | Questions thread
John Michael Winterbourne
John Michael Winterbourne Senior Member • Posts: 2,848
Re: YS

Hmm, I'm not sure about that - I always thought that it isn't really a "Y" as we know it, but a version of the Greek "Upsilon". Whatever, I found this which gives an abbreviated  list of manufacturers of "YS -lenses".

"YS Mount

Sigma's YS mount is a variant of T-mount that adds an aperture control pin. YS mount uses the same threads and flange focal distance as T mount[1], so T-mount adapters can be used on YS mount lenses, though on some lenses there will be an issue of finding a way to keep the aperture pin pushed down so that the manual aperture control works normally. YS mount lenses were available from Sigma, Upsilon, Accura, Polaris, Sun, and other brands.[2]Spiratone sold YS mount lenses and adapters in the U.S. Like T2 adapters, YS adapters have set screws that allow the mount to be rotated. YS mount lenses are often labeled 'YS-AUTO' on the mount."

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