Horizon 202 / HIE- strange fogging problem

["Keith Davison" <keith.davison@xxxxxxxxx>]

When I use Kodak HIE in my Horizon 202 I get a strange pattern of "fogging" 
on the film. 
The "fogging" appears as a stripe of very dark fog starting at the begining of 
the film and running for about 6 Horizon frames, this stripe is located along 
the bottom edge of the film (top edge in the camera), and is very dense near 
the edge, fading to nothing just before the frame edge begins.  This stripe 
also gradually fades in intensity as it runs along the film, disappearing, as I 
have said, by Horizon frame 6.  This "fogging" is very puzzling, I could buy a 
light leak in the Horizon, but why does it only affect the first six frames of 
every film?  To my certain knowledge the last roll of HIE through the Horizon 
was used in very bright sunlight for it's last ten frames, but no light leaks 
appear on that section of the film.  HIE from the same batch, used in my 
conventional 35mm bodies shows no fogging at all.  Colour negative film put 
through the Horizon is also fog free.
I am using a homemade 87C filter, the film is darkloaded, and I process in 
Xtol 1+1. 
This problem does not affect image quality at all, but I am curious as to its 
cause, any ideas?

Keith Davison

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