On Tue, 20 Oct 1998 12:19:18 +0100, Owen Catchpole wrote:

>In article <362891AD.9CE5D035@usa.net>, ValGrande writes
>>My question is whether flourescent light correction filters are
>>necessary for shooting indoors, under fluorescent lights. How much of a
>>difference do they make?
>
>What no-one seems yet to have said is that you cannot repeat cannot
>correct for the effect of light from fluorescent tubes. These emit light
>at only certain frequencies (ie wavelengths/colors) and emit no light at
>all at others. A filter can only "correct" by reducing, selectively,
>light entering the lens. Thus a cold bluish light can be corrected by a
>warm, brownish, filter which reduces the amount of blue reaching the
>lens. What a filter cannot do is add, or change, any particular color of
>light. So if a particular color or colors is/are missing, as is the case
>with the light from fluorescent tubes, no filter on earth can "correct"
>for that

Technically, you are correct, but I have some rather nice slides
taken under flourescent light with a CC30M filter (and prints, without
filtration, but with extra exposure...) of people and other subjects
that look rather good...
Often, "good enough" is good enough...;-)