When measuring my circle of confusion, should I place the tape measure
around my ears or just above them?
When I was a techie, I had a weird habit of shooting test pictures under
controlled conditions (like on a tripod with studio flashes and a
standardized target), evaluating the results, and making notes. Then I'd
know exactly what to expect from a given lens, rather than relying on
calculations or speculation. That was back in the film days, too. Much
easier and more affordable now.
My general experience with casual close-up shooting with a wide assortment
of lenses is that the benefits of increased DOF outweigh the loss of
resolution due to diffraction, unless your subject is flat. For example, I
would shoot a live frog at f/22, and a road-kill frog at f/11 or f/8.
Cheers
John Poirier
----- Original Message -----
From: "Larry Colen" <[email protected]>
To: "Pentax-Discuss Mail List" <[email protected]>
Sent: Monday, April 06, 2009 3:46 PM
Subject: Re: Trading resolution for depth of field
I misunderstood it then. I always thought that the circle of confusion
represented the smallest area that could be resolved. That anything
between a mathematical point and the CoC resolves to the same size,
and that the physical manifestation of this on a digital sensor was a
pixel.
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