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From: howard@sfmag.UUCP (H.M.Moskovitz)
Newsgroups: net.rec.photo
Subject: Re: filters
Message-ID: <814@sfmag.UUCP>
Date: Mon, 16-Dec-85 09:27:10 EST
Article-I.D.: sfmag.814
Posted: Mon Dec 16 09:27:10 1985
Date-Received: Tue, 17-Dec-85 04:52:37 EST
References: <307@tellab3.UUCP>
Organization: AT&T Information Systems, Summit, NJ
Lines: 20

> 
> Since the subject has come up, what books are reccomended for learning
> about filter usage?
> 
> Also, when using a filter with a through the lense meter, is it necessary
> to adjust the exposure by the filter's f-stop rating?  Does altering the
> spectrum of light being metered confuse the metering system?
> 

Since the TTL metering system measures light intensity as it hits
the film plane, adding filters is compensated accordingly. Metering
systems do not know anything about color so this has no effect.

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					Howard Moskovitz
					AT&T Info. Systems
					attunix!howard