At 08:48 1/23/02, Thomas wrote:
But, what is the wide aperture good for if not to use it, that is my
current feeling. The only exceptions were the 2,8/35-80 and the 2,0/90
which were brilliant even wide open.
Additional thoughts:
Most lenses do have greater acuity when stopped down by one to three
stops. Some of the advantage is the extension of the range of "sweet spot"
apertures in a well-designed very fast lens compared to a simpler, slower
lens. The absolute aperture must be wider to detect degradation. In
general usage apertures between f/2 and f/1.2 are not used nearly as much;
the DoF can easily be too narrow. In exceptionally low lighting levels,
usage of those lens speeds is made knowing the tradeoff with both DoF and
with general acuity.
-- John
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