variable aperture (was Re: [Leica] Re: Ten years behind? I think not. )

[brad at bradbrad.com (brad daly)]

here's a question for you smart folks: why is it that leica's R-mount 
zoom lenses are all variable aperture, whereas canon and nikon's pro 
lenses are generally fixed aperture.  i assume there's some optical 
reason for this, and i'm just ignorant.  i know canon increased the 
size of its mount considerably when it went from the FD to the ED (eos) 
mount, which has allowed it some breathing room, wheras nikon worked 
within the constraints of the F mount.  i've only handled an R a few 
times, but i do seem to remember it having a big hole.

always a-wonderin',
brad

--
brad daly       
brad@bradbrad.com
http://www.bradbrad.com

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