Re: [OM] Macro Lens

[Lars Bergquist]

Wrote Foxy:

>Does this mean I'm getting difraction when shooting with my 28mm f3.5 at
>smaller than f8? I haven't noticed any.

You are always getting diffraction! It occurs whenever the light waves pass
an edge, such as the edge of a diaphragm blade, or for that matter that of the
mount when the lens is wide open. When stopping down, proportionally more
of the light waves have to pass the d... edge, so that diffraction increases, and
at last it becomes the major cause of unsharpness.

However, only a really good lens can be 'diffraction limited' at small stops.
Normally, lens aberrations are more prominent, especially wide open! But
without them, diffraction would actually mean that fast lenses would be
sharper than slow lenses, period. Warum einfach wenn es kann so schön
kompliziert sein?


 Vänliga hälsningar/Best regards
Lars Bergquist
Välkommen till/Welcome to ...
<http://www.bahnhof.se/~timberwolf/>

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