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Path: utzoo!linus!philabs!seismo!rochester!ritcv!kar
From: kar@ritcv.UUCP
Newsgroups: net.rec.photo
Subject: Re: RE: GOOD INEXPENSIVE FILM AND PROCESSING
Message-ID: <417@ritcv.UUCP>
Date: Wed, 22-Jun-83 14:25:47 EDT
Article-I.D.: ritcv.417
Posted: Wed Jun 22 14:25:47 1983
Date-Received: Fri, 24-Jun-83 12:33:31 EDT
References: fluke.991
Lines: 21

Regarding the recent discussion of 5247 and 5293 slide films:

	Note that these are negative films.  To obtain slides, the processor
must expose a transparent "print" material to the negatives.  The slides you
get are not what went through your camera (the negatives are).

	So what?  This means that the proper way to place the slides in your
projector is with the emulsion side facing AWAY from the screen, unlike "real"
transparencies.  Since it is the emulsion shrinking more than the film base
that causes the slide to curve, the slides you get from 5247 curve in the wrong
direction compared to "real" transparencies.

	So what?  If you have a recent Kodak projector (maybe other brands too,
I'm not sure) the projection lens is compensates for the curve in normal slides
because it is designed to have a curved plane of focus.  If your slides curve
the other way, it will be impossible to get them focused in the center and the
edges at the same time.  I found it so objectionable that I switched back to
"real" transparency film, even though it costs more than twice as much.

	Ken Reek, Rochester Institute of Technology
	seismo!rochester!ritcv!kar