Archived posting to the Leica Users Group, 1998/02/18
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On Wed, 18 Feb 1998, Robert Rose wrote:
> Duncan wrote:
>
> <<Its diffraction around the edges of the diaphram. Most lenses do this once stopped down>>
>
> Yes, I understand that. (The B.S. in physics at least taught me that much.
> ) But with Leica lenses this happens WIDE OPEN.
>
> Is this a characteristic of "diffraction limited" lenses? I know that on
> a telescope the sharpness of the Airy disk is an indication of the
> optical quality.
If this is the case, then I'm stumped.
I'm curious, how many diaphram blades did the lens used in the street scene
(from the web page) have. From your picture, the star had 14 "points". If
you have a seven bladed diaphram, then I would still suspect that somehow it
was involved.
Duncan