Archived posting to the Leica Users Group, 1997/11/27

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Subject: Re: T*
From: Marc James Small <msmall@roanoke.infi.net>
Date: Thu, 27 Nov 1997 10:13:38 -0500

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