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Valentino

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"RE: Diffraction"

Valentino Awarded for high level skills in landscape and wildlife photography Registered since 04th Dec 2004
Tue 01-Jul-08 05:58 PM | edited Tue 01-Jul-08 06:01 PM by Valentino

It is not that simple. Yes, with a lower density sensor softness from diffraction does not begin until smaller apertures. However, the flip side is that you either need to get closer with the same FL, or use a 50% longer FL to capture the same composition. The longer FL or short distance reduces DOF so you need to stop down more to compensate. So in some cases an extra stop can be a wash

For example, at the same distance to subject, 100 feet...
-D200/D300 @ 50mm @ f/11 the Hyperfocal distance is 36.4 feet

-D3/D700 @ 75mm @ f/16 the Hyperfocal distance is 38.7 feet

http://www.dofmaster.com/dofjs.html

As for macro, you lose 50% of the working distance with the same lens/FL.

Albert J Valentino
Nikonian Moderator Emeritus

Vantage Point Images
Mastery of Composition is the Key to Great Photography

A general, generic topic Diffraction [View all] , RWCooper Silver Member , Tue 01-Jul-08 02:23 PM
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