I remember seeing the first curtain string problem more than 10 years ago at
Oly.
Sometimes you can see it by firing the camera at 1/60 manual, with T32 flash in
shoe, set to high auto, back open with tracing paper laying over the film
plane.
So, what I was getting at was that I've already been through all the guessing
and
hypothesis regarding these shadows. It's a shame that they can turn up at any
time and ruin otherwise great photographs.
John
Joel Wilcox wrote:
> John,
>
> Your diagnosis is not being dismissed or taken lightly. First time I find it
> happen with a different lens, I'll be making arrangements. Not thinking of
> retiring soon are you?
>
> Joel
>
> At 04:19 PM 4/28/1998 -0400, you wrote:
> >Just trying to help. Let me know when you decide what is causing the
> >shadow.....;-)
> >
> >John
> >
> >Winsor Crosby wrote:
> >
> >> >At 10:55 AM 4/25/1998 -0700, you wrote:
> >> >>>At 11:00 AM 4/25/1998 -0400, John wrote:
> >> >>>>That is the shape the curtain string makes when it slackens up and
> >> >>>>hangs into
> >> >>>>the frame during exposure.
> >> >>>>
> >> >>>>John
> >> >>>>Camtech
> >> >>>>
> >> >>>
> >> >>>I think we just had a round of discussion about this recently, but
> darned if
> >> >>>I saved anything about it. This happens to me once or twice about every
> >> >>>third roll. Is it largely an intermittent problem?
> >> >>>
> >> >>>Is there a home fix?
> >> >>>
> >> >>>Joel
> >> >>>
> >> >>Have you looked to see whether that is it?
> >> >>
> >> >>Winsor Crosby
> >> >>Long Beach, California
> >> >>mailto:wincros@xxxxxxxxxxx
> >> >>
> >> >Winsor,
> >> >
> >> >If I understand your question, I've locked up the mirror and looked around
> >> >the mirror box. Nothing. I've set the shutter on bulb and fired a few
> >> >rounds looking for hanging debris. Again nothing.
> >> >
> >> >Since I believe it only happens with one of my lenses, I am now suspicious
> >> >that I'm getting some sort of ghost image or flare off a fungus-scarred
> >> >portion of the rear lens element. Trouble is, I'm not learned enough to
> >> >know whether this is possible.
> >> >
> >> >Thanks for asking. Any ideas?
> >> >
> >> >Joel
> >>
> >> It certainly looks like a shadow, not flare which is light being reflected
> >> about. I was ready to go with John, but since the image is reversed at the
> >> film plane, I think that the shadow of a hanging string would be hanging up
> >> from the bottom edge of the picture.
> >>
> >> It seems to me that if it were something with the lens the shadow would
> >> focus in the viewfinder as well as at the film plane. Can you see it in the
> >> viewfinder? If you can, why don't you try unlatching the suspect lens and
> >> rotating the whole lens as if you were taking it off, but looking through
> >> the viewfinder all the while. If the shadow rotates with the lens barrel it
> >> would seem to be an artifact of the lens.
> >>
> >> If you can not see it through the viewfinder I really think it is something
> >> between the mirror and the film plane. As an experiment I took a single
> >> strand of hair(from my head) and put it across the back a lens before
> >> bayonetting it on my OM1n to see whether I could see it in the viewfinder.
> >> My plan did not work because the strand moved inside the mirror box and
> >> even though I could see its shadow clearly in the viewfinder it took me a
> >> devil of a time to find the actual strand. Very difficult to see a single
> >> fine dark hair in a dark little box with lots of crannies. I would use good
> >> light, magnification, brush, compressed air to see what I could remove.
> >>
> >> Winsor Crosby
> >> Long Beach, California
> >> mailto:wincros@xxxxxxxxxxx
> >>
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> >
> >
> >
> >
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> >
> >
>
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