Alan Bell wrote:
>
> Can we take this to extreme and say--if only sharpness and contrast are
> considerations, not focal length, not depth of field, not a wide
> aperture--that a photo taken with a Canon 50mm 1.8 taken at it best f/stop
> will be sharper than a picture taken with any other Canon lens?
>
To a certain degree, yes. OTOH, fast lenses are also more prone to flare
than slower lenses, which reduces the contrast. And the 50 f/1.8 is still
a quite fast lens. So I'd expect the 50mm f/2.5 macro to be a little better
still at its best f/stop. But all these minute differences, if they are
really there, are taking place on a very high level of performance. They
might make not much of a visible difference in real world shooting. And
while the "more elements means lower contrast" statement has still some
validity, modern lens coatings have greatly reduced the problem. Therefor,
a lens with more elements but better correction of the lens aberrations
can actually have better contrast than a more simple design with less
elements.
Thomas Bantel
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