Sprocket shadows

["Elton N. Kaufmann - Cycloid Fathom Group" <cycloid@xxxxxxxxxxxxxxxxxx>]

I have noticed rather pronounced light-dark patterns across the top of some
of my images that match the sprocket holes in the HIE.  I don't believe I
have seen this when I expose in my usual camera (Nikon 8008s).  It shows up
in the panoramic format.  I use the 135 panoramic adapter in a Mamiya 6MF
range finder.  The pattern shows that the sprocket hole seem to cast a
shadow into the image area (goes in about 10% of frame height or less).
It's as though light is leaking in along the whole edge of the film, but is
blocked by the holes before getting to the image area.  Strangely, I see no
evidence of exposure beyond the image area.  Perhaps there is not enough
light to overcome base plus fog in unexposed regions, but it's noticeable
where exposure has already occurred (like pre-flashing).  Any ideas about
what's causing this and how to stop it.  It is ruining those images that
have the relatively clear zone III skies across the top.
					Thanks,
						EltonK

Exhibiting fine-art and editorial photography
Cycloid Fathom Gallery
Elton N. Kaufmann, Chairman
P. O. Box 8129
Downers Grove, Illinois 60517-8129
USA
cycloid@xxxxxxxxxxxxxxxxxx
http://www.cycloid-fathom.com/gallery/
ftp.cycloid-fathom.com/group/uploads/

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