Archived posting to the Leica Users Group, 2001/04/18

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Subject: Re: [Leica] Was Medium format (now pit-bull arena)
From: Johnny Deadman <>
Date: Wed, 18 Apr 2001 12:30:26 -0400

on 4/18/01 11:02 AM, SonC (Sonny Carter) at wrote:

> I don't think it's a "Circle of Confusion Issue," unless I'm
> confused.  I'm not so sure as you seem to be, there's the
> same physical amount of blur among the same negative image
> sizes of a subject on 2 1/4 Rollei TLR and a Leica with a
> medium tele.  If you're correct using "Physical amount" then
> the word should be "apparent," rather than "significant."

For the same angle of view and the same print size, camera shake is
independent of film format. You can do the geometry yourself, it's easy.

In other words an 8x10 from a 50 on a 35mm camera and a 10x10 from an 80 on
a 6x6 (and for that matter an 8x10 from a 150 on a Speed Graphic) will all
be equally blurred given the same amount of camera movement during the

Working backwards, you can see that all the cameras record the same
*proportional* amount of blur to the negative, but the larger film formats
will show greater *physical* blur, just as they record every other detail

Is this nit now picked?

- -- 
Johnny Deadman