----- Original Message -----
From: "Jostein"
Subject: Re: Temporarily enabled with 2.8/70-200mm
Very true. However, the Canon EOS lenses does not have an aperture ring,
and neither does many nikon lenses. I don't know exactly why C and N have
eliminated them, but it could be a sign in time for the future of the
K-mount.
Canon removed the aperture ring when they went to the EOS system because
they came up with a 100% electronic interface between camera and lens. The
aperture is driven by an electric motor, not a spring.
The Canon rep told me (sorry, not compelling evidence, just anecdotal) that
they felt accuracy and reliability would be improved by eliminating moving
parts, as much as possible, and that in the long run, it would be cheaper
for manufacture and, consequently, for the consumer to purchase.
I don't know about Nikon's reasoning, but it is probably similar.
William Robb
