Re: HIE light leakage

[George L Smyth <GLSmyth@xxxxxxx>]

David Josephson wrote:
>
> I've been asking around about the reason one must load IR film in
> darkness (after several reports from people who were able to do it
> in subdued light, and others saying it was impossible without
> fogging). One person told me that the reason for the requirement
> was that the light trap felt was not opaque to IR -- perhaps not
> always opaque to IR? Same should be true of 70mm cassettes, yet I
> have not had this problem. Other theories?

There are two reasons for the loading requirement.  One is that the felt trap in
the HIE cassette is not IR opaque.  The other is that HIE film does not have an
anti-halation backing, which allows light piping.  This is in reference to 35mm
cassettes, so I can't speak to 70mm.  I got this information from one of Kodak's
IR gurus.

george

- -- 
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