----- Original Message -----
From: "Ray Amos" <[EMAIL PROTECTED]>
>
> > When IS is engaged and I am trying to follow a moving object, I find the
image
> > seems to lag behind the motion, making it very hard to follow it. The
object
> > seems to then ""lurch" forward in the viewfinder as it attempts to catch
up. In
I've found the same tracking erratically flying birds. I think the lens
takes a second or so to realize that panning has started, because it is
invariably my first shot of a series that is not pin sharp (using the
300/2.8IS in mode2).
> > I still think the question raised earlier needs to be answered. Why have
a
> > switch at all if the lens operates as suggested? Still makes no sense.
> >
Maybe to save time in the algorithm? If the lens is in mode 1, it will try
to compensate for any movement all the time. A relatively large movement
(not panning) might get the lens into panning mode and which, off course, it
takes another second or so to get out of. Thus it ensures optimal static
stabilization all the time.
> There have
> been at least 4 different versions: the original, the 100-400 adding mode
2, the
I think the 300/f4 was the first to introduce mode 2.
> super tele's with tripod enabled IS and finally the new 70-200 f/2.8 IS
with 3-stop
> improvement. Who knows what's next?
>
I still think that much of this 2-stop and 3-stop improvement is marketing
hype (practical tests have proved that)
I also find this a fscinating thread and I hope someone can come up with
some answers. I think it is imperative that we know how our IS lenses are
supposed to function in different circumstances.
Regards
Thys
---------------------------------------------------------
Thys van der Merwe
Portfolio of African Images:
http://home.mweb.co.za/te/teknovis
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