From: Witho Worms en Jorien van Santen (verzet13@xs4all.nl)
Date: 11/07/01-07:28:09 AM Z
It is that simple, but look at your prints now and than to find out if you
like them as they have come out.
Cheers,
Witho
----- Original Message -----
From: "clay" <wcharmon@wt.net>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Wednesday, November 07, 2001 3:23 AM
Subject: Re: testing - Breaking the conspiracy of silence (stained
negativecalibration, really)
> OK OK OK. I'll ask a question re the earlier post on Pt/Pd calibration
for
> the stained Pyrocat HD negatives. I have several negative test wedges
> developed at different times, which as you would expect, all have
different
> contrasts when the log exposure is plotted against the transmission
density
> of the resulting negative.
>
> I have printed my assumed 'normal' development time negative test wedge
with
> Pd contrast mixtures of 11/1/12, 8/4/12, and 6/6/12 ratios of sensitizer
#1
> , #2 and metal salt, with the same exposure time on my UV unit. I have
then
> plotted the 'apparent' densities that my b&w densitometer reads on the
> negatives against the reflective densities of the Pd test prints. The
> result is remarkably similar to the curves that are in Dick Arentz's book,
> only with much reduced absolute numbers for the negative transmission
> densities. It seems to me that I now have a set of customized curves that
> correlate the effective stain density present in my negative processing
with
> the resulting print density at a standard print exposure time. Am I being
> too naive to believe that I can now use them exactly like the curves in
> Dick's book to compute the correct contrast mixture and exposure time for
> future negatives? It seems almost too simple and easy.
>
> Ok, I did my part to stir the pot.
>
> Clay
> ----------
> >From: FotoDave@aol.com
> >To: alt-photo-process-l@skyway.usask.ca
> >Subject: Re: testing
> >Date: Tue, Nov 6, 2001, 6:34 PM
> >
>
> >double checking ....
> >
>
This archive was generated by hypermail 2b30 : 12/10/01-11:12:21 AM Z CST