[pure-silver] Re: Film processing problem
- From: Myron Gochnauer <goch@xxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 17 Sep 2012 10:14:25 -0300
I have a borrowed Pentax 6x7 that exhibited a similar problem. My best *guess*
was/is that it was a light leak caused by deteriorated seals around the film
"door". The sealing materials was, in fact, gummy.
I have now replaced all the seals, but have not yet tested the result in bright
sunlight. …so I can't say this *was* the problem. The seals were clearly
bad, though.
Aside from inspecting the seals around the door, your student might see what
happens if she tapes over all seams with black electrical tape.
Myron
On 2012-09-17, at 12:08 AM, <andpph@xxxxxxxxxxxxx> wrote:
> If the marks go from edge to edge of the film then it can not be a shutter
> problem but must be a light leak of some kind in my opinion. The distance
> between marks (whether fixed or variable) might provide a clue. As well as
> her handling of the camera as someone suggested - meaning time that the film
> might have been still ... I am also assuming that the bands are not exactly
> the same density. If they are the same density (like D-max) then that is a
> clue for some possibilities. If they vary in density that is a clue for
> others. Is one side of the dark band darker than the other? Once I had a
> student lose a screw that happened to go right through the body into the film
> chamber ... this caused artifacts ... don't remember what it was anymore but
> the culprit was the missing screw.
>
> Andrew
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