Re: [APML] tech pan revisited

["DEREK BAKER" <derekb@sympatico.ca>]

For what it's worth...Could it be a) a linear light leak parallel to the
axis in the hypering film drum, or b) the film was intermittently
rubbing/touching something in the drum as it was rotated before/during/after
hypering? or c) something similar to a) or b) during development? IMHO, In
the case of b) or c) chemicals may have been unevenly distributed (too much
then too little) in lines parallel to the axis of rotation/perpendicular to
the sprockets?

Good luck

Derek


----- Original Message -----
From: Jerry Lodriguss <jerry@astropix.com>
To: Discussion of Film Astrophotography <astro-photo@seds.org>
Sent: Friday, September 05, 2003 1:31 AM
Subject: Re: [APML] tech pan revisited


>
> >  Scott's somewhat puzzling image is here:
> >http://www.creatorsview.com/pages/demo.html
>
>
> Hi John,
>
> Thanks for the link.
>
> I was wrong about having seen lines like this before from scratches from
> dirt in the felt light trap.
>
> The lines appear to be dark lines of density in the negative image.  They
> are not scratches where the emulsion was removed which would make dark
> lines in the positive image.
>
> This implies a light source.
>
> They are pretty straight but don't always run parallel.  They are not
> static electricity, which would look like lightning.
>
> It certainly doesn't look like the emulsion cracking.
>
> It doesn't look like any kind of moisture during exposure, or development
> problem.
>
> The predominant lines are light in the positive image, but there are also
> dark lines on each side of a light one. The dark lines seem more diffuse.
>
> In one case (4th line from the left), a single light line at the bottom
> forks into two lines at the middle of the frame. The 5th line from the
> right does the opposite.
>
> This is just a crazy mystery!
>
> Jerry
>
>
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>
>
>
>
> Photoshop for Astrophotographers - http://www.astropix.com/PFA/PFA.HTM
>
>
>
>
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>
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>

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