Archived posting to the Leica Users Group, 2001/02/06

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Subject: Re: [Leica] how can the 75 Lux focus go bad?
From: John Collier <>
Date: Tue, 06 Feb 2001 20:40:14 -0700

Depth of field is a factor of image size and relative aperture. The film
format/ lens combination affects the image size. A 45mm lens in on a 4x5
camera will record an object "smaller" in the final print than a 45mm on a
35mm camera. You could enlarge the 4x5 negative more than normally is done
and print an identical image size (assuming you shot both cameras at the
same subject distance) and achieve identical depth of field (and COC) but
this is not normal practice.

John Collier

> From: "Austin Franklin" <>
> This web page changes the DOF based on film format...why would film format
> effect DOF?