P3D Optimum sharpness

["KENNETH LUKER" <KLUKER@xxxxxxxxxxxxxxxxxxxxxxx>]

I've learned from this list that sometimes a smaller aperture is 
detrimental to sharpness, due to diffraction.  Can someone explain how 
one can see the difference between un-sharpness due to wide aperture 
(loss of depth of field) and un-sharpness due to TOO SMALL an 
aperture which has caused diffraction?  How do these differ in 
appearance, and how can one determine the optimum f-stop?  

Seems to me that in 3-d, we want sharpness throughout.  If a 3-d 
view has diffraction-caused fuzziness, can one see a place in the 
view where that fuzziness begins, or is it present throughout the 
view?

Ken Luker_______________________________________________________________
Kenneth Luker
Marriott Library Systems and Technical Services
KLUKER@xxxxxxxxxxxxxxxx


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