Thys wrote:
>
> ----- 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
> -----------------------------------------------------------
>
I was wndering what was going on when I tried to
shoot some ducks taking off from a lagoon. Of
course, they were going up and across the plane
of the lens (100-400), Not as sharp as I
expected...
Skip
--
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SHADOWCATCHER IMAGERY
Fine Art Black and White Photography
http://www.shadowcatcherimagery.com
Skip and Heather Middleton
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