Re: diffraction (was 4x5 focusing)

[boblong@xxxxxxxxxxx (Robert Long)]

On Mon, 22 Jul 1996 20:43:24 +0200, Willem-Jan Markerink wrote:

|But there seems to be a difference between diffraction and edge
|diffraction; the first only occurring at aperatures equal to or
|smaller than the wavelength of light, the latter with apertures as
|used in normal photography. 

Yes, "diffraction grating" diffraction, for instance, vs the moving
image you sometimes see in dodging a print.  I've never really
understood the latter kind.

What I don't understand in the present context is why a smaller
aperture would increase the edge diffraction.

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Topic No. 6