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Re: [OM] Light Foam

Subject: Re: [OM] Light Foam
From: "Keith Berry" <k.berry@xxxxxxxxxxxxx>
Date: Thu, 8 Feb 2001 11:54:51 -0000
Winsor Crosby  wrote:
> Does anyone know why uns*table urethane foam is used to seal the light out
> of cameras?  Seems to me that some sort of thin, black velour would be
just
> as effective and a lot more permanent.  Didn't they use something like
that
> in pre-plastic days?

Russian cameras are light trapped with black velvet for flat areas or to
prevent unwanted reflections, black linen of some kind compressed and glued
for where a sliding back fits into, and strands of black wool for slots that
a hinged back closes into. I haven't seen any reports of deterioration of
any of this, except that if it gets flattened you just add another layer.
Some of these cameras pre-date the OM range by a decade or two.

Cheaper Russian cameras left the factory with no effective light trapping,
leaving it as a DIY job for the user. An editor of a Russian photo magazine
posted that every Russian photographer knows the value and use of black
velvet, scissors and glue!

-Keith Berry,
-Birmingham, England



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