At http://www.photo.net/photo/star-streak.html
I found this explanation for using f /11 instead of f /16 for moon photos. It
makes sense to me.
"Your exposure should be f /11 and a shutter speed of 1/ film speed
(e.g. f /11 and 1/400 with ISO 400 film). The moon is illuminated by the full
light of the sun, attenuated to some extent by our atmosphere. You could say
the same about your friend's face on a sunny day, in which case you'd apply
the "sunny 16 rule" and set f /16 and 1/ film speed. Why the discrepancy? The
moon is made of darkish gray rock. But we see it at night when [our] eyes are
adjusted to the dark so it looks rather white. In order to have the moon
appear white on film, you need to over expose it by 1 f stop, i.e., use f /11
instead of f /16."
As I said, it sounds like a feasible explanation ( I don't know if I
agree that it looks white because our eyes are adjusted to the dark, it looks
white to me even before my eyes are adjusted. Maybe it looks white because
it's against a black background?) But anyway, according to our astronauts,
the moon IS gray (varying shades of gray depending on the angle of the sun to
your direction of view).
mmm.... sounds like a situation to spot meter and hit the "HILIGHT"
button, doesn't it?
George S.
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