RE: ortho film and halftone

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From: Breukel, C. (HKG) (C.Breukel@lumc.nl)
Date: 10/29/02-03:03:36 AM Z


Philippe,
 
It is perfectly possible to obtain high densities on lith film in LC1
developer. I have made sucsesfully Albumine and Pd prints with LC1 processed
lith film (continous tone). I have made stepwedges with lith film in LC1,
and to obtain higher densities, simply develop longer (still cont. tone).
For curves see PF#6
 
See for an example: http://www.f32.net/discus/ ,discussion forum under
techniques.
 
Best,
 
Cor

-----Original Message-----
From: FotoDave@aol.com [mailto:FotoDave@aol.com]
Sent: Monday, October 28, 2002 6:10 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: ortho film and halftone

Could anyone on the list show that a density range of 2.0 or more is
achievable on ortho film (with LC-1 or whatever low contrast diluted
developper), that with a full tonal range between fog and d-max.

Philippe,

We do get full tonal range (or full exposure range). The full density range
is indeed low because we have to slow down the development so much to use
the normally flat region. Cor Breukel shows some curves in Post Factory
issue #6. The density range is only about 1.0, but I believe he was using
visual density. If one measures the blue density, the density range is
actually higher and might be high enough for Pt/Pd prints.

My feeling is that those of you who are talking about halftones have indeed
halftones, but with a shorter range than on normal halftone film. Such a
shorter range is therefore of no help for Pd or Pt/Pd.

I don't know if you are planning to use Ortho film as in-camera negative. If
you are using it to make interpositive and then final negative, they key is
to make an interpositive of low density range, then you can use stronger
development (e.g. LC-1 without stock B or D-76 or Dektol) and you can have
whatever density range you need for your final negative (is 3.0 - 4.0
enough)? ;-)

Dave S


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