----- Original Message -----
From: Hugo G�vert <[EMAIL PROTECTED]>
> > According to a previous message
> > 1) Nikon's VR starts up faster then Canon's IS
> > 2) can automatically detect panning
> > 3) can pan in both vertical and horizontal direction
> > (not sure about that, though)
>
> Canon can pan in both vertical and horizontal directions too. (well those
> IS lenses than have the 2 modes). And in that panning mode it also detects
> the direction of panning automatically. Wonder how ti works if it can not
> detect the direction... maybe it corrects both directions, maybe not.
> Impossible to say from outside Canon (they probably won't tell...), but
My guess would be that it uses a piezo element, similsr that is used in
helicopters to control the rear rotor, i.e. a change in direction creates an
unbalance of currents on different sides of the element. This current can be
transferred to the control system to counteract the motion.
> > Also some people say that IS gives more then 2 stops
> > improvement. So maybe the optimistic 3 stops from
> > Nikon is closer to reality then the conservative 2
> > stops from Canon.
>
> Canons reasons for 2 stops have been in their books (the graph) and if
> Nikon found any reason to go say 3 stops, of course they had to say that.
> Canon would have done the same. One can not really take those numbers as
> any truth. Only way is to test them personally (or read a review where
> one person has tested both equally).
Canon have been known to be conservative in their statements (which I
personally eppreciate in this world of marketing hypes). As stated before
inthis list the true amount probably is relative to the real amount of
shake, i.e. the stadiness of the hand that is holding the lens. For me it
would probably be 2 stops for either system, for someone else 3 stops.
Best Regards
Olli
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