Archived posting to the Leica Users Group, 1998/05/20

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Subject: Re: [Leica] Q: lens diaphragm not circular when fully opened ?
From: "Richard W. Hemingway" <n5xrd@telepath.com>
Date: Wed, 20 May 1998 21:58:08 -0500
 
Phong,

 >   looks more like a jagged circle with the end of the 9 (?) blades 
>   protruding into the circle.  What is even more strange is that I would 
>   open the diaphragm a bit pass the 2.8 detent, and the diaphragm becomes
>   more fully circular, though still not perfectly so.
>
>   None of my lenses (Leica and others) exhibit this phenomenon.  When
>   set at full aperture, they are all fully circular.
>
>   Has anybody seen anything similar ? Does anyone have a plausible
>explanation ?

Mine is new and does the same thing.  Just the way it is made, I assume.
No problem with pictures as far as I can tell.

Dick  Hemingway
Norman, OK