Differences should not be perceptible as long as you stay at 250mm from
the print. Unless, of course, you have sharper than normal vision which
may be the case. But if you do or if you find that you're really pixel
peeping and find that's your norm then you don't need a new Merklinger
theory of DoF. You only need to tighten the assumptions on CoC and
close down another stop or two from the markings on your lens.
Chuck Norcutt
Piers Hemy wrote:
> Chuck, I agree with both your points below but my persepctive is a bit
> different (and not because I'm using a shift lens!) - it's that we judge
> whether an image is "out of focus" by reference to other parts of the image
> which are "in focus". If the lens can resolve better than the theory
> assumes, then even though the 8x10 is within acceptable tolerances
> (enlargement size, viewing distance) for a sharp image, differences are
> perceptible.
>
> Perhaos it's that I am looking at the image too closely?
>
> Perhaps "pixel peeping" has a longer heritage than just digital
> photography??
>
>
> --
> Piers
>
> -----Original Message-----
> From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
> Of Chuck Norcutt
> Sent: 30 November 2007 12:37
> To: olympus@xxxxxxxxxx
> Subject: [OM] Re: Is the emperor called hyperfocal distance that well
> dressed?
>
> --snip
> Although he may be interested in knowing if June is recognizable as June at
> 50 meters I'm not. I want to know if June is critically sharp at 50 meters
> for a 16x20 print and she's not.
>
> --snip
>
> If your lens and film/sensor can resolve enough detail for a crisp 16x20
> rather than an 8x10 that's good. But it doesn't obviate the accuracy of the
> DoF markings when used as intended... for an 8x10 max print size.
>
> --snip
>
>
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