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Re: [OM] IMG: Sunrise, Moonset

Subject: Re: [OM] IMG: Sunrise, Moonset
From: Mike Lazzari <watershed@xxxxxxxxxxxxxxx>
Date: Wed, 22 Oct 2014 09:30:27 -0700
It's only an objective fact once you have defined the desired Circle of
Confusion. And we might well find that the generally-accepted CoC for a
given format dates back to the 1920s. I suspect that the resolving power of
all parts of the image-forming chain in aggregate has improved somewhat
since then, as has our ability (and propensity) to inspect images far more
closely. Result? It appears that hyperfocal scales are wildly optimistic,
because we can see that the in-focus area is significantly narrower than it
"should" be. Note "appears", as the scales have indeed been calculated
properly according to time-honoured formulae - it's just that we look too
closely (pixel-peeping).
Exactly Piers. The math stems from a definition of what's "sharp" and that is an anachronism at best and and mostly useless as is the mathematical exercise outside of its entertainment value. My reference to digital/analogue was referring not to technology but to the way of thinking. Hyperfocal is a digital concept. Inside the arbitrarily marked zone is ON, outside is OFF. Look through the viewfinder and turn the focusing ring and what you see is analogue. Even this is going to change soon I think. However I don't think that we look too closely/pixel-peep. I like the ability to make significant crops and still have a useable image.

Mike
not missing the hyperfocal marks
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