[rollei_list] Re: Rolleiflex Mirrors.
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 22 Mar 2007 23:21:20 -0700
----- Original Message -----
From: "todd belcher" <todd_belcher@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, March 21, 2007 9:14 AM
Subject: [rollei_list] Re: Rolleiflex Mirrors.
Many people say they manufacture these mirrors to Rollei
specs, but
they do not know what they are really talking about. The
'hard' part
of manufacturing these mirrors to spec is that they are
vacuum coated
with the same anti-reflection material that is on lenses.
This
prevents the front surface mirror material from tarnishing.
todd
I suspect the mirror coatings are actually slightly
different but on the same line. Mirror coatings can be made
to increase the reflectivity of the mirror material was well
as providing considerable protection to the mirror. Graphs
in standard optics handbooks show the results of such
coatings which can improve the overall efficiency of an
aluminum mirror to that of silver.
Coating of either lenses or mirrors is not trivial.
There is a good deal of general information about vacuum
coating at the Society of Vacuum Coaters site:
http://www.svc.org
Click on "History" for some very intresting
publications.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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