[HUG ] Re: Cleaning the Mirror

DEAR LIST,
        I forward the following from my former professor of graduate optics
at RIT, John Carson, in reply to my sending him the collodion method I use
to clean SLR mirrors.
                CHEERS!
                        BOB



-----Original Message-----
From: j c [mailto:biswel_753@xxxxxxxxxxx] 
Sent: Tuesday, February 19, 2008 10:56 AM
To: BOB KISS
Subject: RE: [HUG ] Cleaning the Mirror


Bob,
 I've never had to clean an SLR mirror but did clean a diffraction grating
from a monochromator using exactly the method you suggest, pure collodion.
I think this method is traceable to a technician from Beckman Instruments
who serviced their spectrophotometers.  I'd probably recommend carefully
checking what materials are adjacent to the mirror.  The collodion contains
ether and that might cause problems.  Do not forget that the flash point of
collodion is quite low, so no sparks or open flame in the vicinity.  That
means NO SMOKING!
  
 There's also the method of lightly dragging moistened lens cleaning tissue
gently over the surface.  This is great for mounted lenses where collodion
might possibly wreak havoc with the lens mount blackening and markings.
I've used it with success for that purpose.  This method might be traceable
to an old Perkin-Elmer bulletin that dealt with laser resonator mirrors, I
think.  (Been a long time...) 

The answer you really wanted is that your advice was OK;  just hope that its
recipient is not a total screw-up.

John



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