Re: pt/pd stops

[etienne garbaux <photographeur@nerdshack.com>]

Chris wrote:

> Can someone tell me the greatest amount of stops they have gotten 
> with pt/pd? Or put it in terms of logs or DR, if that's how you do it.
I use the traditional formula, 100% Pt, no contrast agent, and you 
can clearly see all 31 steps of a 3.05 wedge on the very smooth, very 
white papers I favor.  That is the exposure scale, of course -- the 
print Dmax is generally 1.5 or so.  I usually make negatives with a 
DR of 3.1-3.2 for this process (which limits one's choice of films).

Best regards,

etienne