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Main
Date: 21 Oct 2006 19:44:31
From: dan&lisa
Subject: defocused pattern anomaly
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Hello,
I was just out with my MN66 and had Vega unfocused. I noticed what appeared
like a reflection of the diffraction pattern at the outer ring. At times
there were two or three spread out around the perimeter but the brightest
one was always present even when I switched eyepieces. The scope appears to
be in good alignment and the seeing is average. Does anyone have any idea
what I'm seeing?
Thanks,
Dan
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Date: 21 Oct 2006 20:32:33
From: dan&lisa
Subject: Re: defocused pattern anomaly
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I've found some images of out-of-focus star patterns and it appears that the
"anomaly" is normal.
Dan
"dan&lisa" <dan_lisa@videotron.ca > wrote in message
news:Chy_g.35116$Da6.628457@weber.videotron.net...
> Hello,
>
> I was just out with my MN66 and had Vega unfocused. I noticed what
> appeared like a reflection of the diffraction pattern at the outer ring.
> At times there were two or three spread out around the perimeter but the
> brightest one was always present even when I switched eyepieces. The scope
> appears to be in good alignment and the seeing is average. Does anyone
> have any idea what I'm seeing?
>
> Thanks,
> Dan
>
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