[pure-silver] Re: Copying b&w 35mm negs w/bellows/slide copier

        ----- Message d'origine -----   
De: richard lahrson <gtripspud@xxxxxxxxx>       
Date: Sun, 9 Jan 2011 16:53:51 -0800    
Sujet: [pure-silver] Copying b&w 35mm negs w/bellows/slide copier       
À: pure-silver@xxxxxxxxxxxxx    
Hi! 
 
 I'd like to make some b&w positives to project in 35mm.  Any 
 help with choice of film/developer?  I see this done and some are 
 better than others.  Bracketing range, etc.?     Best, Rich 
 
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Quite a long time ago, I put up a page on B/W slides, one option is copying an 
existing negative:
http://www.bonavolta.ch/hobby/en/photo/slidesbw.htm#Negative
There is some loss of quality despite the use of a good macro lens (I used a 
Micro-Nikkor lens + bellow + slide copier) but is not bad at all.
The problem is to find now a film with a sufficiently clear base as most of the 
technical films have disappeared (Agfa Ortho 25, Technical Pan, ...).
In terms of development, you need quite an energic development.
The gamma of a slide must be high already with normal subjects but, as you 
start from a negative with a low contrast, the contrast of the positive must be 
even higher.

Maco seems (not tried personally) to have something that can be used:
http://www.mahn.net/TAOrte.htm

Otherwise you can try other standard low speed films but they have a darker 
base, typically the 100 iso T-grain films (Acros, TMX, Delta).

Claudio Bonavolta
www.bonavolta.ch

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