Oh, I do agree. But my hypothesis assumed natural, from-the-heavens lighting,
without the use of reflectors or other light modifiers and considered only the
intervention of an innocently floating cloud that might bring about a general
decrease in the overall level of illumination. Now, if we want to account for
lighting accessories and enhancements, or a photographer falling asleep or into
a trance while the movement of the big, bright heavenly body casts the shadow
of a nearby tree across a portion of the scene, then, yeah, this may not be the
perfect solution. However, it's close enough for guv'mint work, which is more
or less my standard. And NASA's, I suspect. :-)
Walt
-------------- Original message from AG Schnozz : --------------
> --- Walt Wayman wrote:
> > This ain't rocket science.
>
> Actually, there is a slight fault to your methodology. While it
> works great for compositions where the subject and background
> maintain the same lighting ratios, it will fail if you are
> dealing with a situation where the subject of interest occupies
> a small portion of the scene or is off-balance.
>
> If I base my exposure (divine inspiration being preferred
> method) on a small or offset portion of the picture and then
> flip it over to centerweighted auto, I can dial in exposure
> compensation to match my "D.I." exposure. IF the brightness of
> the centerweighted region ALWAYS maintains the same brightness
> ratio to my offset or tiny subject I'm ok. However, if the
> lighting conditions of the overall scene are different than my
> subject then I've got problems. This will occur if you are using
> light modifiers such as umbrellas, shades, diffusion panels,
> smoke or mirrors.
>
> See, I just made it rocket science.
>
> AG-Schnozz
>
> p.s. This method DOES work and works extremely well. Just be
> aware that it isn't a universal solution.
>
>
>
>
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