Hi Bob,On my Sigma f4 lens its written T3/YS Is the T3 a development of the YS or...
Cheers, Ronald Bob Shell wrote:
On Dec 10, 2005, at 9:54 AM, Ronald Arvidsson wrote:The YS-mount to begin with was used in the 70's by a number of lens manufacturers (maybe they were al Sigma?). Sun, Focal, Sigma. Its also called the T3 mount. This mount was developed by Sigma.The YS mount was a Sigma exclusive. It is not the same as T3. Bob
