Archived posting to the Leica Users Group, 2001/02/07

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Subject: RE: [Leica] DOF DOESN'T EXIST! (was: how can the 75 Lux focusgo bad?)
From: "Austin Franklin" <austin@darkroom.com>
Date: Wed, 7 Feb 2001 11:08:51 -0500

> There IS **NO** OBJECTIVE BASIS for depth-of-field!

DOF is very amorphous for the most part, but there are concrete DOF
mechanisms, and if you understand them, you can control it reasonably well.

There is recorded on film DOF...if your lense is sharper than your film can
record, you will record at the highest resolution the film is capable of
over a certain distance in the image...

Then there is printed DOF, that the print can only handle so much
resolution, typically less than the film, and any resolution on the film
that is more than the printed image can handle will appear at the same
sharpness...

Then there's human viewable DOF...where the same parts of an image held at
20" will appear out of focus, will appear sharp at 20'...

Replies: Reply from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] DOF DOESN'T EXIST! (was: how can the 75 Lux focusgo bad?))