Liam Lawless (lawless@vignette.freeserve.co.uk)
Sun, 07 Mar 1999 04:15:18 +0000
Hi Kevin,
No, just an ordinary print developer (Dektol, PQ Universal, etc., at normal
working strength, though I use a PQ developer of my own formulation). I
take it you mean you haven't seen my article in Post-Factory #2, in which
case I can send you something adapted from my workshop notes for people who
missed P-F! Let me know if you want it, and whether you'd be able to open a
MS-Word document attached to an e-mail, or whether you'd need it as a DOS
text file. The Word document has a couple of diagrams that you might find
useful.
By the way, I think you've missed the point of my filter idea: what I
intended was for magenta coloured light above the negative and a pale cyan
filter below the lens. The light will be strong where transmitted by the
shadow portions of the negative, and consequently little altered by the pale
filter, but the light transmitted by the highlights of the negative will be
of much lower intensity and, with a cyan filter of suitable strength, will
have its colour modified towards blue. The point of all this is that the
magenta light which thus prints the shadows is (I believe) of lower actinic
power on lith film (i.e. does not affect the film so much) as the blue light
emanating from the highlight areas and so the shadows receive less exposure
while the highlights get more. Thus contrast is reduced.
Initially I agreed with Sil that it wouldn't work, but thinking about it
again it seems that he might be wrong because magenta light can be regarded
as having a blue and a red component: a cyan filter will transmit the blue
while holding back the red, whereas he seemed to be suggesting that a cyan
filter would transmit no magenta light. I've contacted him offlist and am
awaiting a reply.
Liam
-----Original Message-----
From: Kevin O'Brien <kob@paradise.net.nz>
To: alt-photo-process-l@sask.usask.ca <alt-photo-process-l@sask.usask.ca>;
Alt Photo <alt-photo-process-l@usask.ca>
Date: 07 March 1999 02:20
Subject: Re: Contrast control for reversal
>Liam, I haven't had the opportunity of seeing your paper and I have been
>following this much interest having been down this track in the past.
>
>Are you using a silver solvent in the first developer ?
>
>Kevin O'Brien
>
>
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