From: Monnoyer Philippe (monnoyer@imec.be)
Date: 08/28/02-03:30:22 AM Z
I bought MACO Geniusfilm sheets (and other MACO films) for alt-phot. I had constantly streaks parallel to a border of the sheets. There was no way to avoid it. I returned it to the shop.
The streaks were lines of uneven density, very visible in large zones of even tone (studio backgrounds ...). I am pretty sure this was an uneven coating at the fab (eastern europe I think).
I do not trust Maco films and do not recommend it.
Philippe
|-----Original Message-----
|From: Steve Shapiro [mailto:sgshiya@redshift.com]
|Sent: Wednesday, August 28, 2002 09:35
|To: alt-photo-process-l@skyway.usask.ca
|Subject: Ortho Lith Film Streaks
|
|
|> On Mon, 26 Aug 2002, Steve Shapiro wrote:
|> > I have been getting streaks developing Ortho film from
|contact negatives
|off
|> > color transparencies, was this already discussed?
|> >
|
|Thanks for the link to our archives. I couldn't find the
|paper by Craine,
|but I did find out why I'm getting streaks. Too short a
|development time.
|The film has to be exposed for a longer development time.
|While the image
|comes up sooner, the continuous tone will evolve clearly after a full
|development as some of the emulsion halides will develope
|leaving the rest
|to come into full development as the film on the whole
|developes out to a
|Dmax based on the emulsion engineering. Don't use the eye, is
|perhpas the
|answer, but make sense with exposure time and development
|times of a minimum
|3- 6 minutes. If the image comes up in less than 3 minutes,
|it will streak
|in the fix, so less exposure will allow continuous tone with full
|development.
|
|I hope none of you had this problem, because I'm afraid I
|didn't explain it
|very well.
|
|
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