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Path: utzoo!watmath!watcgl!dmmartindale
From: dmmartindale@watcgl.UUCP (Dave Martindale)
Newsgroups: net.rec.photo
Subject: Re: Skylight Filter.
Message-ID: <2421@watcgl.UUCP>
Date: Fri, 13-Apr-84 02:30:34 EST
Article-I.D.: watcgl.2421
Posted: Fri Apr 13 02:30:34 1984
Date-Received: Fri, 13-Apr-84 21:11:17 EST
References: <7382@cornell.UUCP>
Organization: U of Waterloo, Ontario
Lines: 9

Photographic film is sensitive to ultraviolet light which is not visible
to the human eye.  It will cause photographs of distant scenery to
appear more hazy (and bluish, with colour film) than your eye saw.
A UV filter removes much of the ultraviolet but has no effect on visible
light.  The 1A filter does this, and also removes a small amount of blue.
The intent is to "reduce the excess bluishness of outdoor color scenes
photographed in open shade under a clear, blue sky" [Kodak's filter databook].
I interpret this to mean that the filter is tuned for use with colour film
outdoors.  I don't know what a 1B filter is.