Archived posting to the Leica Users Group, 1997/09/26

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Subject: Re: 90/2.8--internal reflections
From: "Jacques Bilinski" <jbilin@axionet.com>
Date: Fri, 26 Sep 1997 18:09:52 -0700

> 
> >The reason it doesn't apply is that as you move twice as far away from a
> >subject you will only get one quarter of the light from each square
> >centimeter on the subject, but you will also cover 4 times as many
square
> >centimeters, so the result is that the exposure doesn't change. 
> 
> Interesting. But the point is, the sunny 16 rule works with the moon.
It's
> a subject in bright sunlight.
> 
>
The sunny 16 rule DOES apply when taking pictures of the moon, it's the
inverse square law that doesn't apply when taking pictures of the moon (but
it does apply when using the moon as a light source). The interesting thing
about using the sunny 16 rule with the moon as a subject is that the
reflection of the light off the subject (the moon) takes place before the
absorbsion of light by the earth's atmosphere unlike with subjects on
earth. If you were an astronaught on the moon the sunny 16 rule would not
work because the light would not pass through the earth's atmosphere.