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
On 29/01/2008, at 6:36 PM, C.H.Ling wrote:
> Yes, it was wide open, the images are actual pixel, if you view
> them at full
> size on monitor you will not see the difference even with a 1600x1200
> monitor. I had sent the camera to Olympus for fixing the AF issue
> (with
> sample images and details), they just said there was no problem after
> checking with my camera.
>
> I expected new firmware can solve the problem but it was not. The
> focus was
> not stable, sometimes it works better under the same test
> condition. It was
> very strange, at the long end of the same lens there was no problem
> (or much
> less a issue).
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