----- Original Message -----
From: "Matthew Hunt"
Subject: Re: FA 1.4/50mm tested by DPReview
On Thu, Nov 13, 2008 at 9:29 PM, JC OConnell <[EMAIL PROTECTED]> wrote:
In that case, FF and aps format would be the SAME DOF,
neither one would have "deeper" dof. And print size is
not a factor either.
You are incorrect.
The DOF depends on the following factors:
Lens focal length (f)
Lens focal ratio (f-number, N)
Subject distance (s)
Allowable circle of confusion (c)
Actually, it depends purely on the magnification ratio and alowable COC.
Focal length doesn't matter, nor does subject distance.
Don't try to correct John on this, he's forgotten more than most people know
on the subject.
William Robb
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