[rollei_list] Re: Whiteface T with Xenar question
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Fri, 20 Mar 2009 18:34:48 -0700
----- Original Message -----
From: Peter K.
To: rollei_list@xxxxxxxxxxxxx
Sent: Friday, March 20, 2009 2:59 PM
Subject: [rollei_list] Re: Whiteface T with Xenar question
You misread. What I meant was better coatings than they, JSK
that is, had in previous decades. The 50s coatings on
Xenotars were horribly soft. Much softer than those on Zeiss
lenses. Not sure why, but since coatings were designed for
specific use perhaps their formula was not up to par until
years later.
Peter K
There is a great deal more to a coating than the
"formula". The method of deposition and baking in vacuo is
of considerable importance in making the coating hard and
for its adherance to the glass. I have no idea what
Schneider's practice was but I have certainly seen Schneider
lenses where the coating appears to have rubbed off in
spots.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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