[pure-silver] Re: B&W Positive from B&W Negative.

----- Message d'origine -----
De: "Speedy ." <speedgraphic@xxxxxxxxxxx>
Date: Tue, 26 Jun 2007 20:02:28 +0000
Sujet: [pure-silver] B&W Positive from B&W Negative.
À: pure-silver@xxxxxxxxxxxxx

>This question was posted on another forum I am on and thus far the only 
>contribution has been my speculation on where I would I start if I were to 
>try this.  There are many here who are much more knowledgable than I am and 
>since I am somewhat interested in trying this someday I thought I'd ask for 
>your advice.
>
>What are we trying?  To create projectable B&W 35mm transparancies made by 
>copying Black and white 35mm negatives in a slide duplicator.
>
>What film would you use?  How would you expose and develop it?
>
>Thanks in advance!
>Speedy

I did some B/W slides in the past using a copy from a standard negative in the 
past.
I used a bellow and slide duplicator together with a macro lens (a repro lens 
would be better) which lets you use your camera meter to make the exposure.
Although you loose something, I like this approach because you keep your 
original neg untouched.

You can find a description of this method on this page:
http://www.bonavolta.ch/hobby/en/photo/slidesbw.htm#Negative

Now, the film I used (Agfa Ortho 25) has disappeared since a long time, TP, a 
good replacement, has also disappeared and special films may be difficult to 
find.

A normal slide film is already a pretty contrasty film, making a slide from a 
neg that has a lower contrast than a normal scene requires even a higher 
contrast.
A standard film requires a very high contrast development to compensate for its 
naturally low contrast.
Some have a reasonably clear base like the Acros 100 or TMX.

In Europe, you may give a look to films like the Maco Ortho (should be called 
Rollei Ortho 25 now and may be very similar to the old Agfa film, see 
http://www.mahn.net) or similar very low speed films with a higher than normal 
contrast *and* clear base.

You may need to experiment somewhat to find the suitable development time.

Good luck,
Claudio Bonavolta
http://www.bonavolta.ch

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