Archived posting to the Leica Users Group, 1999/01/10

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Subject: Re: [Leica] new 90mm Sumicron
From: csocolow <csocolow@microserve.net>
Date: Sun, 10 Jan 1999 18:42:51 -0500

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Walter S Delesandri wrote:
SNIP

> The main PROBLEM with the 90 f2 is focusing it wide open with an
> M4-6 rangefinder.  It requires care.  When I had questions about
> focus, I put it on both my M bodies, and used a ground glass....
> checked at 10' and 3' -- it was PERFECT.....so any focus problem
> was my fault!!SNIP
> raid of the Summicron.
> 
> Cheers,
> Walt
> 

Walt,

please tell me your ground glass procedure. I'm assuming you've got a
piece of ground glass that will fit in the film rails with the back open
and that somehow you secure it flat at the film plane. Then I assume you
loupe the image (much like on a view camera) with the lens focused on a
target at the measured distances you cited. Hopefully, the focus scale
of the lens, the measured distance and the coincident images in the
rangefinder all agree. Am I correctly describing the procedure and where
did you get a piece of ground glass that small?

Carl Socolow
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