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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