Archived posting to the Leica Users Group, 1996/08/02

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Subject: Re: 50mm Summicrons - more questions for Marc...
From: Marc James Small <>
Date: Sat, 03 Aug 1996 00:17:09 -0400

I don't have all my references at hand, but, trust me, the collapsible and
rigid first-generation Summicrons ARE different.  Take one of each and put
them side by side:  the rear element on the rigid is slightly larger and
protrudes a bit further.  The designs are quite close, but not identical.
Leica has hemmed and hawed about this over the years, but one telling point
is that they obtained a separate patent for the rigid version.

The NF/DR lens MAY or may not be optically identical to the rigid:  I
suspect it is a bit different, but I cannot confirm this, and I'm not going
to take any of my lenses apart to find out.

The optical performance of the collapsible Summicron is great but the rigid
and NF are better.  The rigid is a bit sharper and has somewhat better edge
performance than does the collapsible lens.  

Marc  FAX:  +540/343-7315
Cha robh bas fir gun ghras fir!