Thanks for the info Moose :)
A very nice and complete explanation :)
Allan
PS No trees were harmed in the sending of this message and a very large
number of electrons were asked their permission to be terribly
inconvenienced. (And threw a party for them afterwards for being really cool
about it).
Disrupting the unnatural balance that you, as a conscious human being and a
confused mass of energy, have created.
-Disturb the mind -
>From: Moose <olymoose@xxxxxxxxx>
>Reply-To: olympus@xxxxxxxxxx
>To: olympus@xxxxxxxxxx
>Subject: [OM] Re: What is CA?
>Date: Thu, 07 Dec 2006 19:58:15 -0800
>
>Allan Mee wrote:
> > The term ''IS' has been mentioned a lot lately with regard to lenses -
>but
> > I've been too afraid to ask lol The only 'IS' I know of was a range of
>Oly
> > fixed zoom lens film cameras that looked liked SLRs - e.g. the IS100,
>IS500,
> > IS1000 etc.
> > I suspect the term 'IS' has nothing to do with said cameras (as it was
>used
> > in connection with Canon Zoom lenses IIRC)
> >
>In this context, IS means Image Stabilization, which is Canon's term and
>has become the generic reference term as well. Nikon calls their version
>VR, Vibration Reduction, I think, and other manufacturers have other
>names. My favorite may be "Mega OIS", Mega Optical Image Stabilization.
>
>There are two very different ways of implementation. The original IS and
>VR, and some others, are accomplished in the lens, where one part of the
>optical system is moved based on signals from motion sensors to keep the
>image on the film/sensor stable. The other broad category uses movement
>of the sensor to accomplish the same thing, more or less.
>
>The new Pentax K10D is unique in being able to rotate the sensor as well
>as move it up and down. It will be interesting to see how well that works.
>
>Different implementations, as expected, have different effectiveness.
>The best lens based ones seem to add 3+ stops to handholdablility. Body
>based ones seem generally to be a little behind that so far. But they
>have the advantage of working for whatever lens is mounted. There is a
>lot of variation. One test of the new Leica for the Panny version of the
>E-330 showed no more than about 2 stops of effectiveness, which
>disappointed the tester.
>
>The interchangeable lens IS and VR lenses from C and N are already into
>second and third generation designs and are very good, but generally
>larger and heavier than the non stabilized versions.
>
>It drives Oly fans wild that there are no IS solutions in their DSLRs
>except for the one new Leica.
>
>Moose
>
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