At 3:25 AM +0200 5/15/04, Listar wrote:
>Date: Thu, 13 May 2004 22:09:22 -0400
>Subject: [OM] Re: Anomalies in E-1/OM Images -- Update
>From: Andrew Gullen <andrew.gullen@xxxxxxxxxxxx>
>
>on 2004/05/13 8:20 PM, Cyrtolite@xxxxxxx at Cyrtolite@xxxxxxx wrote:
>
>> The spots are about perfectly circular and the larger ones are
>> composed of concentric rings.
>
>They aren't Newton rings are they? Or have we discussed this already?
No, they aren't Newton Rings, which arise when two pieces of glass
(say two lenses) get too close together, close enough that
interference becomes noticeable.
They are diffraction (Airy) patterns in the shadows of particles of
dust on the glass cover of the image sensor.
Joe Gwinn
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