----- Original Message -----
From: "Neil K." <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, July 18, 2001 9:18 PM
Subject: Re: Rebel S II (EOS 1000FN) and Kodak HIE
> At 7:00 PM +0100 7/18/01, Keith Green wrote:
> >It isn't caused by how the long the film is static at the exposure
position
> >is it.
> >By which I mean if you shoot several frames off very quickly they
wouldn't
> >have such a mark except possibly on the first one.
>
> Hm. That seems unlikely to me. The patch would appear to be caused
> by differences in reflectivity between the pressure plate and the
> hole. I don't see how the time the film remains in one position could
> factor into this, since the patch isn't caused by light coming in
> from anywhere other than through the lens. Shutter speed *may* be a
> factor, but that's a different issue from how rapidly the film is
> moved through the film transport mechanism. It's not like the IR
> diode sensor fogging problem, in which the amount of time the film
> spends next to an active LED sensor will obviously affect the amount
> of fogging.
>
> >Anyway, you can always stick some metallic tape on the back of the camera
> >opposite the hole in the pressure plate.
>
> I haven't tried anything yet, but the tricky part will be getting
> the same reflectivity as the black-coloured pressure plate, it seems
> to me. Metallic tape on the camera back interior wouldn't do that.
>
> - Neil K.
Neil,
What I meant, but explained badly, was is the film being fogged from behind,
through the plastic camera back. I have seen this suggested before, on this
list I think, that infra-red can penetrate the plastic, but don't ask me how
true it is.
Stick tape on the outside of the camera back. It might prove if the above
theory is true or not.
Cheers
Keith
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