Re: HIE in Bronica 135W film Backs

[Cameron Shaw <cameron@xxxxxxxxxxxxx>]

George L Smyth wrote:
> 
> On Thu, 22 Jul 1999, Otto Giesenfeld wrote:
> 
> > Is it the felt that leaks light into HIE cartridges? If so, it would seem
> > easy for Kodak to replace it with some more effective kind of felt. I kind
> > of thought that, instead, it was the lack of anti-halation layer in the
> > film that was the culprit. (Making the film act as an optical fibre and
> > lead light into the cartridge.) Is there a well-established knowledge
> > (outside Kodak) on why HIE has to be loaded in darkness?
> 
> I asked Kodak's head IR guy about this when preparing my article on EIR,
> and was told that the felt is not IR opaque, AND the
> film does not have an anti-halation layer.  This is why HIE needs to be
> loaded in the dark.
> 
> george
 Apologies for resending a message by mistake.
I was just going to point out that the HIE film base does not exhibit
a special optical fibre effect more than any other clear film base. It
is simply that the whole film structure is transparent to light so
if a rewound 35 mm HIE cassette is exposed to light, in my experience,
the light simply illuminates the inside of the cassette. This results
in dark lines (light from the slot)appearing on the processed film at
spacings equal to roughly the circumference of the wound reel of film,
when inside the cassette. The lines get gradually fainter as they get
nearer to what was the centre of the film cassette.
Cameron
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