Hasselblad Xpan Fogging reduced by using 87C gels

[Rolland Elliott <liquidriver@xxxxxxxxx>]

I experimented with a Hassy Xpan camera over the week.
Using a camcorder with sensitivity in the infrared
light range, I was able to actually see the IR sensors
light up as the film moved across the film gate of the
camera.  

My motive was to try to reduce the amount of fogging
that the Hasselbald produces on HIE negatives.  
My first attempt was to cut out a tiny piece of 87A
gel and put it over the IR sensors.  Unfortunately,
the camera would not advance the film with this dark
filter over the sensor.  This was puzzling since my IR
sensitive camcorder showed lots of IR light from the
film sprocket sensors penetrating the 87A filter. This
was probably because my camcorders CCD was more
senstive to IR light than the cameras IR sensors were.

Next I tried an 87B Gel; same result, camera would not
advance film.

Lastly I tried an 87C gel over the IR sensors, and the
camera finally worked like it was supposed to.  I also
tried putting two layers of 87C gel over the camera's
sensors and this worked out fine, but three layers of
87C gels was too much.

The two layers of 87C gels greatly reduces the fogging
on the Hasselblad Xpan camera to the point that it is
not noticible in many shots, and hard to spot when it
is present.

One should be aware that switching between panoramic
and regular format shots causes the camera to realign
the film using the IR sensors. Therefore one can
easily cause film fogging by switching between the two
formats repeatedly.  My advice is to keep format
switching to an absolute minimum to minimize fogging.

Perhaps the same technique could be used to reduce IR
fogging in Canon cameras?


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