>Lars wrote:
>
> 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.
>
>
>Lars, this is the best description of diffraction caused unsharpness I have
seen yet. Thank you. I actually understand it now!
Ditto. And as you extend the lens from the film plane, the diffraction
effect becomes greater. Now it all fits into place.
Foxy
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