On 4 Mar 01 at 17:17, Ken Lin wrote:
> >
> > >>My own guess is this. When the tripod/head is rigid and there is little
> or
> > no vibration, IS does disengage. When you loosen the head -- as for
> > following birds in flight -- the gyros sense some vibration and the IS
> > begins to operate again.<<
> >
> > A. When the lens is mounted on a steady tripod and the shutter button is
> > pressed halfway, the IS begins to operate immediately and the image in
> > the
> > viewfinder goes through a very slow vertical shift for about 1 second.
> > After
> > that, if the shutter button continues to be pressed halfway, the IS
> > mechanism automatically goes into a special mode which is designed to
> > detect
> > and correct for mirror slap and shutter movement
> > at slow shutter speeds.
>
> I wonder if this can be further "proven" by some who has one of these
> super-tele lenses to listen for the IS sound, both of my "lesser" IS lenses
> can be heard while IS is in operation.
See a chapter on my homepage with several IS<->tripod notes
(including the original posting in the current thread)
http://www.a1.nl/phomepag/markerink/is_tripo.htm
(there are a few more related to other aspects of IS, hit /index for
a complete list of:
eosis*.*
eos_is*.*
is_*.*
(not all are .html'ized yet, some are .txt)
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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