Delvo,

Thanks for the extensive info!

I asked about "lens size (focal ratio or objective lens diameter)" primarily
to learn more about different lenses, rather than about adjusting the lens
aperture, but you did cover both topics.

What does changing the ISO setting do? My guess is that it changes the
electronic bias on the CCD. (Which I must have read about 15 years ago
and haven't thought of since.)

-- Jeff, in Minneapolis

__________________
http://www.FreeMars.org/jeff/

"The other planets?
Well, they just happen to be there, but the point of rockets is to explore them!"
-- Kai Yeves