I have a bit of a dumb question here...something I've probably missed out on by never having formally studied photography I'm sure...
Aperature...is there a "standard" or some kind of mathmatical equation that determines how much light is passed thru a lens at a given aperature? For example, with my old Canon 35mm gear I know that f/3.5 on my old Canon 55mm is going to allow the same amount of light (more or less) as f/3.5 on my 25-70mm Sigma...at least to my eyes it always seemed pretty equivilant. Now does that hold true for digitals as well...is f/3.5 on my Sony H1 letting in the same amount of light as say that Canon 55mm? Does image sensor size play a factor in this at all?
This doesn't really affect the way I really do anything, but it's a curiousity that's been kind of bugging me (LOL!).
As always, thanks for any info!
Bright Blessings & Gentle Breezes,