In article <4bbjpa$3ve@pallo.cs.hut.fi>, ilu@niksula.hut.fi says...
>In article <4b6re2$e68@newsstand.cit.cornell.edu>,
>Bob Neuman wrote:
>>Hmmm... If you want to see color response error clearly, photograph
>>flowers close up! The saturated reds will have you moving ASA 40 film
>>down towards 25 ASA (and even lower) in a hurry to avoid dark slides.
>>Also, try metering off a grey card without, then with red, orange,
>>dark yellow, green and blue filters with known filter factors - you
>>will notice considerable error between the meter readings and the
>>(filter factor) predicted readings, unless your meter is color
>>corrected. BTW, the old selenium cell meters (yuh, those antiques)
>>have less color error than most modern meters. But, as I said before,
>>unless the colors being metered are fairly saturated, you may not
>>notice the errors.

>What is a color corrected meter then: one that has similar
>response to the film, or a constant response?
>If you take b/w film and meter two different reds,
>a "frequency-indifferent" meter would produce different things
>on film, but a "film-response" meter would get them to look
>the same. (I think :-)

Ah, there's the rub - film is not flat in its color response,
nor is it consistent from one film to another. A "color corrected"
meter is almost certainly not perfectly color corrected to any
standard, let alone to flat response, or to the average response
of film, or to a particular film's response. Not having used one,
it is my guess that a "color corrected" meter would get you much
closer to average film response than an uncorrected meter, and
close enough for practical work, given the level of saturation
of most colors in nature. I posted the above to counter the
impression that many people may have that spot meters will give
good readings of anything they are pointed at (or that filters
on lenses will be compensated for correctly by the TTL meters in
cameras). But, maybe it all has to do with the infrared sensitivity
of the meters, as was posted after my post above.....
Hope this helps.