In a message back in 2005 (!) which is here:
http://lists.tako.de/Olympus-OM/2005-03/msg02121.html I referenced two articles
in Zeiss Camera Lens News. Not all the early editions of CLN are available
online at http://blogs.zeiss.com/photo/en/?page_id=18 but No 1, Summer 1997, is
the key, and I quote the conclusion of the article “Depth of Field – An
Insider’s Look Behind The Scenes” therein.
Let’s sum it up for today:
• The international depth of field standard, the basis for all camera lens
manufacturers to calculate their depth of field scales and tables, dates back
from a time, when image quality was severely limited by the films available.
• Those who use depth of field scales, tables, and formulas (e. g. for
hyperfocal settings), restrict themselves – most probably without knowing why –
to the image quality potential of an average pre-World-War-II emulsion.
I don’t believe that undermines anything that has been posted so far, rather it
gives some perspective (in the non-technical sense!)to the different views
expressed.
And once again, Merklinger’s writings are well worth the read for the very
different approach he takes.
Piers
From: piers.hemy@xxxxxxxxx [mailto:piers.hemy@xxxxxxxxx] On Behalf Of Piers Hemy
Sent: 22 October 2014 22:41
To: Olympus Camera Discussion
Subject: Re: [OM] IMG: Sunrise, Moonset
Chuck, I understood Mike to be using 'digital' in the sense of 'binary', being
either in or out of focus. Not related directly to the mode of capture.
Piers
PS We seem to have covered the issue every five years or so. 2004 & 2009
AFAICT!
On 22 Oct 2014 22:35, "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
You seem awfully stubborn on this point that hyperfocal is a digtial concept.
Here's a quote... and note the date
------------------------------------------------------------------------
When the lens is focused on the hyperfocal distance, the depth of field extends
from half the hyperfocal distance to infinity.
Photography, Phil Davis, 1972.
------------------------------------------------------------------------
The concept goes back way farther than 1972. That's just the earliest record I
could find easily. Apparently Maitani was a true visionary. He marked your OM
primes with DOF marks to include hyperfocal (if you know how to use them). He
was a visionary since he must have predicted that digital photography would
come along and then this strange digital focusing concept he'd created would be
useful.
Once you understand what hyperfocal is all about, if you find that using
standard tables and assumptions doesn't produce suitably sharp work for you
then tighten up the specs to suit yourself.
Chuck Norcutt
On 10/22/2014 12:30 PM, Mike Lazzari wrote:
Hyperfocal is a digital concept.
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