[HUG ] Re: Cleaning the Mirror

Generally, if I'm blowing air into the chamber, I remove the finder and lens
and blow from above; less likely to cause damage.

 

BTW, I've used Q-tips and alcohol GENTLY on several mirrors with no ill
effect.

 

Karl Wolz

 

  _____  

From: hasselblad-bounce@xxxxxxxxxxxxx
[mailto:hasselblad-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Adler
Sent: Tuesday, February 19, 2008 12:42 PM
To: hasselblad@xxxxxxxxxxxxx
Subject: [HUG ] Re: Cleaning the Mirror

 

Just got off the phone after speaking directly with HB NJ. Paul stated that
putting a couple of drops of Kodak lens cleaner (or ROR - I confirmed that
was OK with him) on a few sheets of crumpled Kodak lens tissue and genlty
"dabbing" it on the mirror to loosen any grime, and repeating that process
several times ("gently" being the key word) would be fine. When I expressed
concern about how delicate the surface of the mirror was because it was
surface mounted silver, he stated he wasn't sure of the accuracy of that
statement. He said the mirror was under coated and not as delicate as I was
describing.

Paul also stated that removing the prism/focusing screen and lens allows one
to clean the mirror from either opening.

So that's the word from HB NJ, for what it's worth...

boB

BOB KISS <bobkiss@xxxxxxxxxxxxx> wrote:

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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Bob Adler
Palo Alto, CA
http://www.raflexions.com

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