On Sun, 19 Nov 2000, Olli Liuksia wrote:
>
> ----- 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.
Well... wasn't really asking for specifics :-) just that if there is a
null zone somewhere where it hasn't really detected any panning and thus
is working as normally, or does constantly change the corrected direction
when the lens is kept at very stabile position. Or maybe the null zone is
just so that the panning direction isn't changed from the previous one
(which was first chosen at the same time the IS was enganged) to the new
one if the difference is not large enough.
> 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.
Definitely true.
Best regards,
Hugo.
************************************************************
** Hugo G�vert **
** [EMAIL PROTECTED] http://www.hut.fi/~hugo **
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