Archived posting to the Leica Users Group, 1997/11/24

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Subject: DOF question (was: Mistake in ...)
From: Alfred Breull <puma@hannover.sgh-net.de>
Date: Mon, 24 Nov 1997 19:09:35 +0100

Art,

Thanks for your attention and information. May I ask:

Is there a changement in the general consens meanwhile?
I learnt (long long years ago), that the DOF-limits are about 1/3 before 
the subject and 2/3 behind. So, I can't explain your -3.2 and +3.3 cm at
f 1.4 from the 1.4/75 mm Summilux.

Alf
- --------------------------------------------------------------------
At 10:55 24.11.1997 -0500, you wrote:
>A misplaced decimal in Paul Ross's article in J'Accuse Leica makes for a
>serious error in his calculation of depth of field.  A 75mm lens at f1.4
>focused to 2 meters has a depth of field of 6.5 CENTImeters (not 6
>millimeters).  However I wouldn't get too overconfident with the additional
>D.O.F.  D.O.F. is composed of acceptable focus in front (3.2cm) and in back
>(3.3cm) of your point of focus.