On Fri, 12 Jul 2002 11:47:15 +0200, "Xm@n°" wrote:

>I have just bought my first colour filter (Yellow medium) for B&W
>photography.
>Since I have read about filter facor and exposure compensation I wonder: do
>I have to compensate or the camera meter system do it automaticly (I suppose
>it do)?
>
>Since I have never used it before (I wanted the green-yellow but there was
>not one in the store) can somebody give me some information how to used at
>best (I know general story about darkened sky).
>
>Thanks in advance for any answer!

Sigh....
The popular medium yellow, unfortunately, in reality
will make almost no visible difference in the image
(contrary to popular opinion, and the examples in the
filter brochures...;-), but will cost you about 2/3rds
of a stop in light transmission... Better would be a
dark yellow, an orange, or for really noticeable effects,
a red (preferably all "sharp-cutting" for greatest
effect due to color...). As for the metering, I have
not checked the most recent cameras with TTL metering,
but in the immediate past, most misread color so badly
that filter-factors needed to be applied (about 1/2
stop for dark yellow, 1 stop for orange, and 1.5 stops
for red needed to be added to the TTL exposure reading
for correct middle-grey results).