On 15 Mar 2003 at 22:21, Ken Durling wrote:
> I don't quite know how to phrase this. I"m wondering how "absolute"
> the action of IS is. IOW, if there's a range of camera movement
> within which IS will basically stabilize uniformly. Say I'm shooting
> at 1/8 - 1/20 sec with IS on: will there be much of a difference in
> the sharpness of the shot if I brace myself, hold my breath, squeeze
> the shutter - all the slow shutter speed techniques - and if I just
> compose, focus and shoot as though I was shooting at 1/250? Can I
> still optimize sharpness with IS on?
>
> Hope that was clear.
A confirmation in the other direction was given by a German photo
mag, years ago....they showed an image improvement with the 300/4 up
to 1/1000s.
Note that this is also congruent with the concept that a sturdy
tripod will improve image quality nearly always, definitely close to
the hand-held limit, but even far beyond.
And yes, this also applies towards the slower end, 1/20s will look
like 1/80s (the conservative factor 2x); just not sure whether it
stays a factor 2 into the extremes, as somewhere down the line you
would switch to mono- and tripod anyway, introducing different
vibration/dampening variables....and without mono- or tripod,
quantification of 'image quality' will get harder and harder anyway.
And with monopod and a panning-mode lens (only the higher end IS-
lenses have this), pulling along with your moving object, the object
will be 2 stops sharper, while the background is equally blurred.
The highest-end tele's even have a tripod-mode, slowing down
vibrations on a different level....I once watched this effect with a
600/4-IS mounted on a Canon videocamera, mounted on a clumsy
tripod....very impressive effect, and this is the longest
shutterspeed you can get....:))
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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