Archived posting to the Leica Users Group, 1997/09/13

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Subject: Re: Noctilux/flange to film plane
From: Dan Cardish <dcardish@microtec.net>
Date: Sat, 13 Sep 1997 07:50:06 -0400

At 12:34 AM 13-09-97 -0400, Marvin Moss wrote:
>In a message dated 97-09-12 23:28:03 EDT, you write:
>
>Joe B. (etal
>
>   A little known problem sometime arises with wide apertures & the resulting
> shallow depth of focus due to the flange to film plane distance being off
>more
> than 1/10 of a mm (that's only 1/250 of an inch).  I think a heavy squeezing
> of a zinc body can cause this & for critical work, you can test the d.f.
>your-
> self with just a few test exposures or have a technician use a depth gauge
>if
> you focus is off even slightly.  I have taken c.u. pix at f:1.0 where one
>eye 
> was in focus & the other out, so we are talking about a very close
>tolerance.

Years ago I owned a Minolta SRT-101 that came with a 58mm/1.2 lens (Still
have the lens, body was stolen).  There was a story circulating in the
photo mags in the '60s that Minolta individually matched up the 1.2 lenses
with camera bodies when bought as a unit.  Maybe this has to do with
overcoming variations in film plane to lens flange distances.  I do know
the the lens was very good.

Dan C.