From: Richard Knoppow (dickburk@ix.netcom.com)
Date: 02/28/03-04:15:25 PM Z
----- Original Message -----
From: "Shannon Stoney" <sstoney@pdq.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, February 28, 2003 1:50 PM
Subject: fogging on negatives
> I have been processing some 8x10 negatives that I made in
December
> and January on a trip to TN, and a lot of the images have
fogging
> around the bottom of the image, the bottom sides I should
say.
> Sometimes I think this is caused by the film holder not
being seated
> correctly in the camera back, so that the top of it
protrudes a
> little. I need to be more careful about that. But, how
can I test
> to see if any of the film holders are leaking?
>
> Also, I never seemed to have this problem with the 4x5
camera. The
> 8x10 seems to have a tighter spring on the back so that
it's harder
> to push the film holder all the way down. Is this just
because the
> film holders are heavier so the spring has to be tighter?
Also, the
> fogging begins about 1/4" into the image. The very edges
of the
> image are ok.
>
> --shannon
I've found it useful to do the opposite of what has been
recommended, that is look from the inside of the camera. Put
a sheet of plain white paper into a holder and put that in
the camera. Take off the lens board and shine a stong light
all around the back. Look through the lens board You should
be able to see any leaks.
Two other possibilities. One is a hole in the lens board
(not likely where the fog is consistent at an edge) the
other is a reflection from the part of the camera back
adjacent to the film. Sometimes you can see this on the
ground glass. Try removing the lens board and shining the
light into the camera from various angles. The cure for
reflections is to paint the surfaces with absorbent paint.
The best is Krylon Ultra Flat Black. It comes in spray cans
but you can spray some into a container and use a brush.
Sometimes holders do not latch properly. This tends to let
light in at the end the dark slides are removed from. Most
holders have a ridge at this end which fits a groove in the
camera back.
If your camera has a removable back also try taking it
off, loading a holder into it and examining the surfaces the
holder touches. This is also a good way to check for
reflective surfaces near the film.
Also check that the back itself seats properly in the
camera.
--- Richard Knoppow Los Angeles, CA, USA dickburk@ix.netcom.com
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