Archived posting to the Leica Users Group, 2000/09/26

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Subject: [Leica] Re: a yellowing spot makes no difference
From: Jim Brick <jim_brick@agilent.com>
Date: Tue, 26 Sep 2000 07:33:58 -0700
References: <B5F58E1E.9564%jbcollier@home.com> <39D06057.F675C66F@yahoo.com>

Funny thing, it really doesn't make any difference what color the spot is.
If it starts to yellow, what difference could it make, a 1/10th of a stop?
BFD! Reflected meters used through the lens by a photographer are not
accurate to within at least a half stop. The reflectance of your subject,
the color, the brightness, are all subjective and when you point the
camera, take a reading, you may even point the camera to the side, up at
the sky, at the grass, or whatever, but you still won't be within a half
stop of "exactly the perfect exposure" for any particular scene. Sometimes
you are lucky, but you will be just as lucky with a yellow spot. So a
minuscule shift in EV by a yellowing spot (which probably won't happen
anyway) is totally insignificant.

And if you send your camera in for a CLA sometime during its/your life, to
anyone, they will automatically calibrate the meter so the color makes no
difference. It's calibrated out.

Jim


>Javier Perez wrote:
>> 
>> If it doesn't decolour about 50-60 years
>> it won't matter since that's about the time
>> it takes for rubberized cloth to start to cracking
>> But if it happens sooner, say 30 years it will be a problem.
>> What would we think of the M3 if they had started developing
>> annoying poroblems in 1984.<<<<<<<<<<<
>
At 07:01 AM 9/26/00 -0700, Ted Grant wrote:
>
>Heck Javier, most of us will be in the big darkroom in sky before we
>ever see the white spot change colour, so why sweat it! :-)  Besides I'm
>taking at least one of my M6's with me and a couple bricks of film! ;-) 
>
>ted 
>Victoria, Canada
>http://www.islandnet.com/~tedgrant

In reply to: Message from John Collier <jbcollier@home.com> (Re: [Leica] Fw: but now its about the white spot)
Message from Javier Perez <summarex@yahoo.com> (Re: [Leica] Fw: but now its about the white spot)