I believe the different in sharpness between IS and non-IS lens is due to
extra lens elements. For camera IS, the different does not exit. Still, may
be the compensation mechanism of the IS could cause problem but I do not see
the different in E-3 yet.
For landscape, slight focus problem can be fully compensated with lens stop
down to F8 or F11.
C.H.Ling
----- Original Message -----
From: "Andrew Fildes" <afildes@xxxxxxxxxxxxx>
>
> If I submitted an image to a stock agency, they would examine it at
> 100%. Therefore I would expect an image from a professional grade
> camera to show reasonable sharpness and definition at actual pixel
> magnification. That's where the difference really shows up between a
> good compact, a cheap SLR and a good SLR.
> That said, I would expect an image at 100% from a manual focus lens
> or a good lens in MF mode (with the body on a tripod) with IS off to
> be sharper than an AF image with IS on. AF can be variable,
> especially in multi-point focus modes as it may make different
> decisions on sequential exposures. That's one reason that I prefer
> single point focussing for normal usage. IS does tend to soften an
> image a little (Canon IS L-grade lens are softer than non-IS for
> instance). It's usually only and issue for critical landscape work.
> That's why people put Leica R lenses on EOS bodies - or even OM Zuiko's!
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
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