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From: smh@mhuxl.UUCP (henning)
Newsgroups: net.rec.photo
Subject: Re: Slide film vs Color Neg. film
Message-ID: <292@mhuxl.UUCP>
Date: Sun, 3-Nov-85 23:17:20 EST
Article-I.D.: mhuxl.292
Posted: Sun Nov  3 23:17:20 1985
Date-Received: Tue, 5-Nov-85 07:02:26 EST
References: <298@tekig4.UUCP> <349@vaxwaller.UUCP> <5746@tekecs.UUCP> <1750@peora.UUCP> <218@astroatc.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
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From the keys of Steve Henning, AT&T Bell Labs, Reading, PA mhuxl!smh

> the color rendition of color negative films is "truer" than for slide films.

The color rendition of color negative films can only be true if you shoot
a grey scale on one of the frames on each roll so the lab knows what filter
pack to use when printing.  All color negatives I have seen have an
orange mask and need a strong compensating mask when printing, but in
addition need tweeking to make white truly white.
As you know, slides come out with as true a color as you are ever
going to get.  In fact you can compare the print with the slide and
see if the print is right.  You can never do that with a negative.

> 2:  The slide film has better latitude and contrast range.

Kodachrome, Ektachrome and every other slide film I have ever used
always built up contrast.  That means you lose detail in the shadows.
With negative films you can preserve the right contrast or use contrasty
papers to change the contrast.  One fine example of contrast build up
is slide duplicates.  Even special copy film still gives much contrast
buildup unless you flash the film before copying.