Archived posting to the Leica Users Group, 2001/11/30

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Subject: Re: [Leica] Doughnuts vs Circles
From: Doug Herr <>
Date: 30 Nov 2001 05:28:50 -0800

On Thu, 29 November 2001, Feliciano di Giorgio wrote:

> Just got some slides back from a test I shot with a Jupiter-3
> (50mm/1.5).
> To my surprise I noticed that when wide open, the out of focus
> highlights
> turned into rings or doughnuts as opposed to the circles I've seen with
> a
> Noctilux or Summilux. It actualy looks very pretty, but I had always
> been
> under the impression that these kinds of artifacts were only seen in the
> domain
> of reflector type lenses (is that the correct term?). The other and
> rather
> shocking thing I noticed was how darn sharp this $50 dollar lens
> was...but
> then again it is a Zeiss at heart.
> Anyone?
> cheers,
> feli
Doughnuts instead of circles results in ni-sen bokeh, a.k.a. "bad" bokeh.

Doug Herr
Birdman of Sacramento
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