Archived posting to the Leica Users Group, 1997/11/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 10:58 PM 11/26/97 -0700, Chris Fortunko wrote: >Does anyone know when Zeiss started using the T* process? Alternatively, >when was a lens with S/N 55.. made? Thank you. The lens dates from late 1971 or 1972. Zeiss began using multi-coating on technical and industrial optics in the middle 1960's (without a T* marking) but didn't begin using this process on camera lenses until 1970. Zeiss and Pentax had pooled their research on this subject (and others) in the late 1960's, and I believe Pentax may have beaten Zeiss with camera lens production by several months. Marc msmall@roanoke.infi.net FAX: +540/343-7315 Cha robh bas fir gun ghras fir!