Subject: Re: Film camera question
Luis Ortega spake thus:
> Thanks to all. I need to check out the various suggestion offered. To
> clarify, the defect is not an undevelopment effect caused by the rails of
> the reels impeding the developer along the sprocket hole areas but
> something that is happening only inside the negative frame itself. It is
> very evident on a contact sheet when you can see all of the frames side by
> side. Each contact frame appears a little whiter and more washed out along
> one edge, usually the bottom edge but sometimes the side edge.
> I work in a school and see dozens of cameras in the darkroom so I can't do a
> lot more than try to follow it up as it happens, but I am curious as to why
> this is happening.
> Thanks to all.
> "Luis Ortega"
>>I see a lot of developed film and contact sheets at my school and every
>>once in a while I see a roll of negatives or a contact sheet that has a
>>thin band of lighter tone (darker on the negatives) at the bottom of most
>>negative frames, as if all the frames got a little overexposure only along
>>one edge. Usually it's the bottom of the negative frame, and the lighter
>>band is soft edged and only about1 or 2 mm thick. The surrounding negative
>>is normal and doesn't look fogged.
>>Could this be caused by the shutter curtains slowing down a little at the
>>end of the travel distance thus giving that part of the film a tiny bit
>>more light? I can't determine if these defects correspong to the direction
>>of travel of the camera's shutter curtain, but if it was caused by an
>>inconsistent shutter curtain speed it should show up along the edge where
>>the shutter curtain ends at.
>>Can anyone advise on what couyld be causing this negative defect?
>>Thanks for any advice.
So it's gotta be an exposure issue, and not light leaks. Most likely
uneven exposure due to dragging shutter curtains, as others have
suggested. A trip to the repair shop for those cameras may be in order.
By the way, if the uneven exposure is along the bottom (long) edge of
the frame, the offending camera has vertically-traveling curtains; along
the short edge, horizontally-traveling ones. Might help to sort out
which camera took which pictures.
I hope that in a few years it [Wikipedia] will be so bloated that it
will simply disintegrate, because I can't stand the thought that this
thing might someday actually be used as a serious reference source.
Because in its current form, it's not to be taken seriously at all.
- Horst Prillinger (see
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