[rollei_list] Re: cleaning old Rolleinars and filters
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sun, 22 Jan 2006 18:29:37 -0800
----- Original Message -----
From: "Marc James Small" <msmall@xxxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Cc: <rollei_list@xxxxxxxxxxxxx>
Sent: Sunday, January 22, 2006 6:01 PM
Subject: [rollei_list] Re: cleaning old Rolleinars and
filters
At 05:49 PM 1/22/06 -0500, Eric Goldstein wrote:
Coatings on glass, however, greatly vary in their hardness,
and this is
where the greatest care is needed in cleaning lens
optics...
We were speaking of the hardness of the glass, not of the
coatings, Eric.
And, in any event, the era of soft coatings pretty much
ended for the major
manufacturers in the later 1950's. The coatings after that
time are about
as hard as is the glass.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
NEW FAX NUMBER: +540-343-8505
See the Society of Vacuum Coaters for much information on
both historical and current coating techniques.
http://www.svc.org/
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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