Is my general understanding correct that ISO in digital means how sensitive the CCD is to light compared to a noise ratio? Has nothing to do with grain I know but will a higher ISO setting produce more noise?
Yes, but it's less obtrusive than similar ISO with film. Also, it can be reduced with any one of a variety of programs.
Also, since were on this... How much of a downfall is there when using traditional lenses not optimized for digital? Is it dramatic difference or not much difference?
Lenses aren't really optimized for digital. Some lenses only fit certain digital cameras because they take advantage of the smaller image circle. But there is no optical optimization other than the image circle size.
Jeff Spirer
Photos: http://www.spirer.com
One People: http://www.onepeople.com/
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