Tim wrote...
"It is always exactly the same elongated arc shape, a thin line approx
5mm wide, that is positioned in exactly the same place on the print - on
the upper edge of the photo.
It almost looks as though someone half placed a cup of coffee on the
print (but it's not that circular).
It isn't entirely black, it just darkens the image behind it. I suppose
it looks like (to a non-too technical photographer) at the time of
exposure, something string-like got in the way of the film."
Hi Tim,
I had what sounds like exactly the same problem with my OM-4. When I posed
the same question to the list I was told that it was due to a shutter
curtain brake problem. The brakes for the shutter curtains are not in sync
and the rear curtain starts to catch up with the front when they slow down
as they pass the film plane. Hence the string that connects the two
curtains pinches together and appears in the shot (quite faint and out of
focus but definitely noticeable).
I'm sure some of the technical experts or more eloquent among us can
provide a better description.
Jason.
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