>>"stopped-down" refers roughly to wide-open + 1 or 2 f-stops and not
>>f/32 or so. Beyond f/16 the quality will usually deteriorate
>>quite rapidly obviously.
>
>Why do you say ".....obviously"?
Just physics - citing the Lens FAQ: "When a beam of parallel light passes
through a circular aperture it spreads out a little, a phenomenon known
as diffraction. The smaller the aperture, the more the spreading" ... and
the more deteriorates quality.
Klaus
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