From: Carl Weese (cweese@earthlink.net)
Date: 03/25/01-08:29:21 AM Z
Sandy,
This is the old problem of two kinds of range. Chrome films, once processed,
have enormous density range. But their ability to capture original subject
tonal range is dismal. That's why my commercial photography kit consisted of
a forty pound case with cameras and lenses, and a hundred and forty pounds
of lighting equipment.
Slide film takes a subject with three stops of lighting range and makes a
4.0 range piece of film. A subject with a six stop range results in a slide
with 4.0 density range, with half the subject matter at 4.0, unless you use
artificial lighting to reduce the lighting ratio to match the film's limited
ability. I'd expect slides of deeply overcast scenes to make great originals
for enlarged negatives. Any subject more contrasty than that will look awful
without masterful use of artificial lighting.---Carl
>
>>2. Slide film has a much lower range of tones compared to B&W film.
>
> How is this? We generally expose B&W negative material to a maximum DR of
> about 1.05 for silver, and 1.4 - 2.2 for alternative processes. Exposed and
> develped slide material has a DR of up to 4.0. How could there be less
> tonal range in the slide?
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