Yes, you are right, I have tested my E-10, the picture is sharpest at around
F4 (not counting the chromatic abbreviation at wide angle, which stopping
down a bit more is better). The new Olympus SLR has a sensor of four times
the size of E-10, it should be better in this area.
C.H.Ling
----- Original Message -----
From: "Chip Stratton" <cstrat@xxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Saturday, December 22, 2001 4:58 AM
Subject: RE: [OM] New Olys - and diffraction
> Not only is lens quality a limiting factor to how much information a CCD
of
> given size can extract, but so are diffraction effects. As we know, lens
> resolution is often diffraction limited past f5.6 on our wide angle 35mm
> camera lenses. I think (if you know for certain, correct me!) that like
> depth of field, diffraction effects are a function of the aperture's
> absolute size, so an aperture that would be f5.6 on a 35mm lens would be
> about f2.8 on the typical digital camera lens. This means that digital
> cameras with the usual sensor size are performing pretty close to the
> diffraction limit when they are wide open, and as you stop down you may
> actually be losing resolution pretty rapidly. f11 might on my C3030 may be
> like f45 (depth of field and diffraction-wise) on my OM.
>
> That may be why you don't see higher f numbers on most digital cameras,
and
> why a move to a larger physical sensor size may be inevitable for higher
> quality.
>
> Please correct me if I am in error here, I didn't pay much attention to
> optics in my physics courses - to my detriment!
>
> Chip Stratton
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