[alt-photo] Re: Vandyke exposure amny. w/ NuArc 26-1KS?

[Terry King]

Loris


Unless all your subjects have the same contrast range, there is no standard exposure.



You need to know:


1. the d max potential of the process , i.e. the maximum density negative that the process will print


2. the d max of your negative for a particular image'


Your exposure will then be 2 in relation to 1 




Terry








-----Original Message-----
From: Loris Medici <mail at loris.medici.name>
To: The alternative photographic processes mailing list <alt-photo-process-list at lists.altphotolist.org>
Sent: Thu, 15 Jul 2010 23:13
Subject: [alt-photo] Vandyke exposure amny. w/ NuArc 26-1KS?


  I've just determined the standard exposure amnt. for gold-thiourea toned Vandykes (on Weston paper, single coat), and it's 160 units (~ 2:25) with a fresh lightbulb and Agfa CopyJet/SelectJet transparency material. I wonder how that compares with your exposure times? 
 
TIA, 
Loris. 
 
P.S. I think I'm going to try double coating; I've got an acceptable dmax, but kinda feel I'll be more happy with something a little better... 
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