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

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Subject: RE: [Leica] RE: Re: how can the 75 Lux focus go bad?
From: "Dan Honemann" <ddh@home.com>
Date: Wed, 7 Feb 2001 05:09:23 -0500
 
> > My ruler test shots show at least 1.5" DOF at ~.7m at f1.4.
>
> Did you take into consideration the angle that the rules was to the film
> plane?

Yes, but my figure is obviously an approximation.  I shot the ruler at
_about_ a 45 degree angle, and roughly two inches are in focus, so I guessed
that to be about 1.5 inches--but I didn't go as far as Pythagoras. :)

Dan