[pure-silver] Re: Development modifications for higher sharpness


-----Original Message-----
From: Christopher Woodhouse <chris.woodhouse@xxxxxxxxxxxx>
Sent: Apr 25, 2005 1:03 PM
To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
Subject: [pure-silver] Development modifications for higher sharpness



Would it be fair to say that the two go hand in hand? That is, you cannot
get higher sharpness if you cannot induce highlight compensation?...or put
the other way around, you need a development scheme that has the developer
weakening in highlight areas, so that it can produce edge effects at a micro
level. For the same reason, the degree of development in large highlight
areas must reduce too at the macro level?
 
-- 
Regards Chris Woodhouse ARPS


As I understand it,  you get sharper images from thinner negs or negs processed 
in weak developer because the depth of development in the grain of the film is 
less, resulting in less difraction of the light as you look at the neg or print 
it.  High accutance developers like Buetlers are very low energy, and then you 
add potassium iodide to cause the edge affect to enhance the appearance of 
sharpness.  The emulsion of ACROS lies so flat and grainless that it is 
probably difficult to change it much.  I am on vacation at the moment with a 
brick of 120 ACROS and when I get back to the lab I am going to try processing 
it all in PMK.. even though the new films like that are not supposed to stain 
very well.  YOu might try your fuji 400 in the PMK or some pyro developer.
D Purdy



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