Archived posting to the Leica Users Group, 2003/12/16
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To Ted & Seth,
The filter built into the optical design question is for the second
version of the 280mm f/2.8 which had a filter slot.
The original version uses a 122mm screw in filter on the front.
As to the 400 & 560 Telyts either the f/5.6 or the f/6.8 version, it
doesn't matter if you use a filter or not.
Lastly, Ted, the f/2.8 280mm APO Telyt-R was designed in 82/83 and the
first prototypes were release for guys like us to play with in early 84.
Not as you said 64.
Happy Holidays & Snaps,
Sal
Sal DiMarco, Jr.
Philadelphia, PA
Web Site: http://members.fcc.net/sal.dimarcojr
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