The Oly spot meter is 2 degrees of field of view. So if you put a 300mm on,
the spot meter meters 2 degrees of a smaller angle. Effectively a variable
angle spot meter.
Try Mike Covington's web page for an astronomy exposure calculator.
http://www.mindspring.com/~covington
Foxy
-----Original Message-----
>The moon is about 1/2 degree across as observed from earth. Just how
>narrow (in degrees) is Oly's spot metering? Just curious since someone was
>suggesting metering the different levels in the moon's image to get better
>results than the sunny 16 could provide.
>
>Patrick
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