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[OM] Re: cleaning sensors

Subject: [OM] Re: cleaning sensors
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Wed, 28 Feb 2007 10:45:55 -0500
No, I believe is was Dr. Tape, Dr. Schmidt, Dr. Maksutov and Dr. 
Cassegrain who collaborated on that experiment to show that a big piece 
of tape on your lens is less detrimental to image quality than the very 
large obstruction created by the secondary mirror on a catadioptric lens 
  or telescope.  Blocks a little light, creates a little extra 
diffraction, causes a little loss of contrast but, as you say, cain't 
hardly tell the difference.  Them what obsesses over a little dust on 
the bottle has it all wrong.

I was just the intermediary in this experiment.  'Course I had to come 
along and lend 'em my camera.  :-)

Chuck Norcutt

Moose wrote:
> Rodti MacLeary wrote:
>> Thanks Moose, and also someone else who suggested a Swiffer but whose email 
>> I accidentally deleted when working my way through the other 200-odd this 
>> morning!  
> The amazing Dr. Swiffer, alter ego of Dr. Flash.
> 
>> I don't think the 'matter' on the mirror is visible through the viewfinder - 
>> it's just that it annoys me to see it there every time I change the lens!  
>> I'll just leave it alone for the moment :-)
>>   
> I assure you far more photographic equipment as been damaged by over 
> cleaning than the reverse. You would be amazed how much crap (In this 
> case, using Walt's definition.) can be on a lens without any discernible 
> effect.
> 
> I believe it may have been the above gentleman and scholar who did some 
> tests with and without a big piece of tape on the front of a lens. 
> Nobody could pick out which was which with any more than random success, 
> as I recall. I certainly couldn't.
> 
> Moose
> 
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