Sigma YS lenses

Sigma YS adapter mounts were available in models to fit popular 35mm SLR cameras. They fitted any YS lens to the particular camera body to provide full automatic operation of the lens diaphragm and meter coupling where appropriate. All YS adapter mounts (and lenses) had the identical specifications as T-mount lenses and adapters. However, with T adapters the operation of YS lenses would be non-automatic.

Third party lenses (14)
Sigma[-XQ] MF 16mm F/2.8 Filtermatic Fisheye [YS] 1973 
Sigma[-XQ] MF [Widerama] 18mm F/3.2 [YS] ⌀72
aka Accura/Sigma 18mm F/3.2
aka Spiratone 18mm F/3.2
aka Spiratone 18mm F/3.5
Pro 1972 
Sigma[-XQ] MF 24mm F/2.8 Filtermatic [YS] ⌀62 1972 
Sigma MF 28mm F/2.8 Widemax [YS] ⌀62 1970 
Sigma[-XQ] MF 35mm F/2.8 [Flash Auto] [YS] ⌀52 1975 
Sigma[-XQ] MF 55mm F/2.8 Macro [YS] ⌀551:2 @ 0.25m 1973 
Sigma[-XQ] MF 100mm F/2.8 Macro [YS] ⌀621:1 @ 0.33mPro 1972 
Sigma MF 120-300mm F/5.6 [YS] ⌀62
Sigma[-XQ] MF [Telemax] 135mm F/2.8 [YS] ⌀52 1971 
Sigmatel / Sigma-XQ MF 135mm F/1.8 [YS] ⌀77 1972 
Sigma[-XQ] MF [Minitel] 200mm F/4 [YS] ⌀52 1971 
Sigma[-XQ] MF 200mm F/3.5 [YS] ⌀58 1976 
Sigma[-XQ] MF [Protel] 200mm F/2.8 [YS] ⌀72 1973 
Sigma[-XQ] MF [Macrotel] 300mm F/4 [YS] ⌀77Pro 1972 

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