kbg32
neo-romanticist
Roger Hicks said:Why?
I'd always thought that the main reason they're so big is Retrofocus designs (up to about 50mm, nowadays) in order to clear the mirror, plus auto-diaphragms and (nowadays) autofocus.
Cheers,
R.
That is just part of it Roger. Full frame sensors are more critical for light gathering. If I can find an article I read awhile ago on lenses for full frame sensors, I'll post a link.