--- Kostas Kavoussanakis <[EMAIL PROTECTED]> wrote:
> Are you sure that (although they may fit) they also retain IS
> capability? Is Canon's IS purely mechanical, or was the EOS
> system so advanced when introduced?
Of course Canon's lenses retain all their capabilities
throughout the EOS line. Canon's foresight in the introduction
of the EOS lens mount was to include supplying power for in-lens
focus servos and completely electronic information exchange
between camera and lens. Their IS system is essentially a lens
grouping mounted on a gimbal with twin gyros, which lock into
axial optical alignment when the IS feature is turned off, so it
operates both completely mechanically and independently of the
camera body other than for power and on/off switching
coordinated with the shutter release. It's a brilliant design.
This is a hand-held exposure at 1/10 of a second with the Canon
10D + 300/4L IS at about a 20-30 foot distance, wide open @ ISO
800. Yes there's motion blur in it... mostly the motion of the
subjects. Believe me, I'm steady but not *that* steady ...
Without IS, my usual bottom limit for this level of camera
motion with an effective 420mm focal length lens is about 1/125
second.
Godfrey
__________________________________
Do you Yahoo!?
Read only the mail you want - Yahoo! Mail SpamGuard.
http://promotions.yahoo.com/new_mail
