[alt-photo] Re: Copy film (Kodak 4125)

[Kevin Morris]

It handles the production of our step wedges very well. We haven't found a 
film as consistent since Kodak Commerical and Copy films were discontinued. 
There are several good films that are useable but are as dependable. 
Granted, the Dmax varies from emulsion to emulsion batch. There have been a 
couple of years when getting a 4.0 optical density was next to impossible.


-----Original Message----- 
From: etienne garbaux
Sent: Wednesday, October 27, 2010 12:39 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: Copy film (Kodak 4125)

Kevin wrote:

>We have found that Ilford Ortho Plus is a very good replacement. It has a 
>very manageable curve to work with, much like Kodak Copy film.

I do not share your enthusiasm for IOP.  While the contrast of IOP
can be adjusted via development, the range of adjustment is similar
to any camera film and far, far less than is possible with the
double-emulsion 4125.  Also, with high-contrast development it shows
a pronounced shoulder, which precludes the sort of fine control of
shadow and highlight densities 4125 made possible, and the D-Max
falls short of what is necessary to make negatives with good
highlight separation at a DR suitable for pure Pt, salt prints, etc.
(i.e., DR >2.3 or so).  It is also much faster than 4125, which makes
it a pain to work with in the darkroom.  T-Max 100 is actually much
better in every respect than IOP for copy use, although the
panchromatic sensitizing makes it that much more of a pain in the
darkroom.  IOP is just an ordinary medium-speed pictorial film that
happens to be orthochromatic, which makes handling easier in the
darkroom.  It is not a real copy film in any sense.

Best regards,

etienne




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