On Mon, 16 Apr 2001, David J Brooks wrote:
> One problem i have when photograph horse jumping, is on a bright
> day-dark horse-and a darkish background like trees with lots of
> greenery,if i expose normaly the horse will be dark,harder to see,and
> the trees nicely exposed.I usually overexpose a small amount but in
> the manual for the sf-1 for ev examples it says to minus (-) the ev
> for subjects infront of dark background and plus (+) if subjext is
> infront of blue sky or snow. I'm sure the book is correct but my brain
> seems to say this is back wards.
As a rule, if the camera sees a lot of bright things, it will try to make
them darker (to roughly 18% reflectance), so a bright background can
darken a foreground subject, and you might want to overexpose a
bit. Conversely, a dark background can cause your camera to
overexpose. This is a function of meters that measure reflected
light. If you measure incident / ambient light, your exposure will be the
same regardless of what your subject is.
chris
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