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[OM] Diffraction limitations?

Subject: [OM] Diffraction limitations?
From: "Keith Quarles" <kquarles@xxxxxxx>
Date: Sat, 24 Aug 2002 12:01:06 -0400
>Ok, I keep hearing about how smaller apertures give greater depth of
>field and apparant sharpness to a point, and then the increase is
>nullified by a rise in diffraction.
>
>My question is this: at what point does this happen? I'm not looking for
>   the mathematical equation to figure it out, I just want to know for a
>given 35mm lens of a given length, say 25, 50, 100, 200, or 300, what
>would be the best aperture for sharpness.
>
>Thanks, Steve Goss, Dallas Tx usa

The rule of thumb I've always heard was 4mm.  From this point and smaller,
expect diffraction effects.  Just divide the lens focal length by the f-stop
to get the aperture diameter.

Keith Quarles
kquarles@xxxxxxx


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