[alt-photo] Re: Creating Film Negative by Enlarging a Film/ Slide Positive

[Dave S (fotodave)]

Ok, this makes me sound old, but yes, I have done it maybe 10-12 years ago.

The high contrast of slides is a slight hinderance. It can have a density
range of about 3.0. Most BW negatives have flat areas of characteristic
curve near the highlight and shadow. You should use TMax film because it has
a VERY LONG straight line curve so you won't lose details.

If you are not handling existing slides, then using negative - positive -
negative approach would be easier.

If you have other specific questions, please feel free to ask further....


Dave

-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Francesco Fragomeni
Sent: Sunday, June 03, 2012 12:11 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Creating Film Negative by Enlarging a Film/ Slide
Positive

I'm interested in enlarging positive film (any slide/ chrome film or B&W
reversal processed film) onto a larger piece of traditional B&W negative
film (not lith) for the purpose of producing enlarged negatives suitable for
alt-process and Azo. I know people do this but I've had a difficult time
finding a solid explanation and instructions for how to go about it since it
is far more common to scan these days which I am very aware of but not
interested in with this particular case.

Basically, can I expose/ enlarge slide (positive) film onto regular B&W
negative film and achieve an enlarged negative? Is the higher contrast of
slide film helpful in this situation or a hinderance? Would it be better to
contact print B&W negative film (much lower contrast) onto another piece of
B&W neg film to produce a positive, develop to the same contrast as the
original, and then enlarge that lower contrast film-interpositive onto a
larger sheet of B&W neg film to achieve the enlarged negative?

I'm interested in this specific process of enlarging film positives to
larger negatives, not the alternatives so lets please try to stay on topic
and not go astray with conversations of digital negatives, duplicating film,
etc., although if reversal processing your original B&W neg to positive
plays a role that might be worth explaining.

Thank you!!

-Francesco Fragomeni
www.francescofragomeni.com
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