[rollei_list] Re: Rolleiflex Mirrors.

I thought that the manufacture of standard aluminized front surface mirrors was pretty standard. The aluminum mirrors that Marvin (redleica1) sells have worked fine for me in the past, as have the pile of cut down polaroid camera mirrors I regularly use. 



Richard Knoppow wrote:
----- 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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