Re: [APML] Optical coatings/alignment - IC410

["John Boudreau" <jeboud@mediaone.net>]

----- Original Message -----
From: Chris & Jennifer Cook <ccjd@ix.netcom.com>
To: <astro-photo@seds.org>
Sent: Thursday, January 24, 2002 2:53 AM
Subject: Re: [APML] Optical coatings/alignment - IC410


> Hi John -
> I got a reply from Al and here's what he says.... "Rotational symmetry law
> is violated for optics. (you would see violent miscollimation on axis to
> produce this kind of flare and it would contain all colors.)"
> He does not know what it could be but did say he will investigate more and
> get back to me.
>
> Chris
>


Chris,

The flare *is* in all color channels. It's just more dominant in the blue,
with the exception of the bright orange star to the right in your IC443/444
image.

If the miscollimation is the culperate, I would think that it wouln't be as
noticeable visually as the photos would lead one to think, as it only
records well on the brighter stars in the field in your longer exposures. It
doesn't show up in your 25 minute Double Cluster shot.


John Boudreau
jeboud@mediaone.net
http://people.ne.mediaone.net/jeboud/astro.htm







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