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From: howard@sfmag.UUCP (H.M.Moskovitz)
Newsgroups: net.rec.photo
Subject: Re: filters
Message-ID: <808@sfmag.UUCP>
Date: Fri, 13-Dec-85 08:36:14 EST
Article-I.D.: sfmag.808
Posted: Fri Dec 13 08:36:14 1985
Date-Received: Sat, 14-Dec-85 07:56:30 EST
References: <1002@homxb.UUCP>
Organization: AT&T Information Systems, Summit, NJ
Lines: 40

> Can anyone recomend a filter that will correct the yellow tint
> that is produced when a photo is taken with indoor lighting.
> Also is there a filter that will allow me to use high speed film
> (iso 1000) outside in brite sun light without shooting at 1/1000 sec
> at f22 ?
> 
> 
> 		Thanks 
> 			Dennis Wombough

The reason you get a yellow tint indoors is that you are using a film
that is balanced for the color temperature of sunlight as opposed to
lightbulbs (also known as tungsten light). To use that film indoors
with incandescent lighting you need a # 82B blue filter. To shoot under
flourescent lighting you need a light pink filter (53??).

Another solution to the problem is to use a film that is color balanced
for use with tungsten lighting. Kodak makes both print and slide films
like that as well as Fuji, 3M, and Agfa. The 3M tungsten slide film is ASA 640!

As far as shooting ASA 1000 in bright sun, it better not to. Use a slower
film that will not need such small apertures and at the same time will
give much better resolution (less grain) and color saturation. I reccomend
ASA 200 as an all-around outdoor film or ASA400 for cloudier low-light days.

If you must use a filter to reduce light, you want a Neutral Density
filter. This is a grey filter that reduces light by a certain number
of f-stops without affecting color balance or resolution. They come in
different 'strengths'. A 2x filter reduces 1 f-stop while an 8x reduces 4.
These are very useful for shooting into the sun in the afternoon. They can
also be stacked to have an additive effect (i.e., a 2x + a 2x = a 4x).


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					Howard Moskovitz
					AT&T Info. Systems
					attunix!howard