Archived posting to the Leica Users Group, 1996/02/01

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To: (Sherril & Bill Erfurth)
Subject: Re: M lenses with coma???
From: (Tore Larsen)
Date: Thu, 1 Feb 1996 12:34:05 +0100 (MET)


> I was reading some Leica things on another system.  One of the people 
> wrote that Leica manufactured M lenses with just a little coma so that 
> the out of focus areas would have a "little glow".
> Is this just true of the older lenses or all Licea M Lenses?

I have a two year old Summicron M 35/2 (Ser. No. 3592163). This lens has
noticeable vignetting and coma at full openings. (These are my _only_
complaints about this lens.) The 35 mm aspehiracal does _much_ better than
the 35/2 at full openings. I also have the 50 and 90 mm Summicron M. These too 
are better than the 35/2.

The Coma has been most distracting when I take night time pictures and have
used full opening. I expect the problem would also be manifest in dim lit
situations with small highlights or surface reflections.

To put things in perspective I should say that I still prefer my 35 mm
Sumicron way above my 35mm f 2.0 Nikkor which doesn't display these two 
faults. Out of my three M-lenses I also use the 35/2 more than the other two

My advice would be to consider your needs. If these shortcomings aren't
really in the way for the kind of pictures you'll be taking, the Summicron
is a very practical lens that is ideal in many situations. If not, you may
want to consider the 35 mm aspherical. Optically it is a true beauty,
although heavier and bulkier than the Summicron.


In reply to: Message from (Sherril & Bill Erfurth ) (M lenses with coma???)