RE: Lith film

Hi Folks,

A caution about APH/S and reversal. Long time ago (before 9/11) I
bought a large box of APH, but with reversal processing found it gave
faint oyster shell markings in certain areas of the image. It hadn't
done this before, and it was fine with conventional processing.
Freestyle couldn't offer any explanation, so I finally put it down to
X-ray damage. However, in recent correspondence Bob Nugent says he's
observed the same fault (also on large sheets, I believe). Don't know
if the film would be X-rayed on internal flights or if it goes on
aeroplanes for US shipping, but I suggest testing with a small box
before making a big investment in film. I've given up on APH until I
hear an explanation for the problem, and am now trying to do digital.
:(

Liam

-----Original Message-----
From: Monnoyer Philippe [mailto:monnoyer@imec.be]
Sent: 12 December 2003 15:37
To: alt-photo-process-l@sask.usask.ca
Subject: RE: Lith film

I want to make my point clear and explain why I started this "lith film"
discussion. My purpose with lith film would be enlarging negs, only,
maybe with reversal processing (I don't like to spend time in
interpositives). I haven't been clear on that, I'm sorry. What I
encountered is indeed a problem of exposure range rather than a problem
of density range (as Dave points it).

I want to enlarge negs with a common contrast (for silver gelatin
printing). For a normal grade B/W paper let's say the neg density range
is 1.6 (I measured it for my working conditions). If I want to enlarge
this neg and project it on a "candidate" sheet film, this sheet film has
to offer a linear response over deltaD = 1.6, this means about 5.5
stops. And, in the same time, yes Sandy, I need a resulting enlarged neg
showing a 3.2 density range. We all have our recipe variations, and in
my case, with palladiotype, I need it. I don't feel like changing my
working conditions, at least not now. Would there exist, in your various
experiences, such a cheap lith film (point here is CHEAP not LITH) -
developper combination, offering the translation of 1.6 deltaD exposure
range into 3.2 deltaD density range (or 2 if stained) ? If you say
clearly YES, please provide all the ACCURATE details otherwise it is
pointless for me. If you say NO, well, too bad, the "lith films" I
tested couldn't seperate such an exposure range at all either. I think
the question is very clear. I expect a yes or no answer (plus details if
yes). It's maybe not the ideal way to enlarge negatives indeed, but I'm
curious.

I wish you all a good week-end,

Philippe
Received on Fri Dec 12 09:55:56 2003