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Re: [OM] Sunny 16?OT re. loony f/4

Subject: Re: [OM] Sunny 16?OT re. loony f/4
From: Jan Steinman <jans@xxxxxxxxxxx>
Date: Mon, 28 Jun 1999 07:52:27 -0700
>From: Joel Wilcox <jowilcox@xxxxxxxxxxxxxxxxxxx>
>
>At 01:59 AM 6/27/99 -0700, you wrote:
>>Light value is proportional to the square of diameter of the light source.
>>The half moon is half a circle with the same diameter as a full moon, thus
>>half the light...
>>
>>: Jan Steinman
>
>If I shoot a side-lit flower against a dark background, exposing for the
>proper values of the flower itself, and not an average of the whole scene,
>I should get a properly exposed photo of a flower against a dark
>background.  If I have two flowers of the same value in the scene, my
>exposure doesn't change.
>
>Why is it different with the moon?  The moon is not a light source per se,
>but reflected light, just like the flowers.

I wasn't claiming you'd have to or want to change the exposure. But there
will be half the light of a full moon with a half moon, just as there will
be half the light with one flower instead of two. What you do with half as
much light (or twice the light, or whatever) is part of the creative
process.

: Jan Steinman <mailto:jans@xxxxxxxxxxx>
: 19280 Rydman Court, West Linn, OR 97068-1331 USA
: +1.503.635.3229

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