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Subject: Re: [M]: Polar alignment accuracy
From: Robin Casady
Reply To: mapug@shore.net
Date: Tue Jun 10 01:08:46 1997

cvedeler@ix.netcom.com wrote:

>Is there a way to calculate field rotation given where in the sky you
>are photographing and how far off your polar alignment is? I haven't
>noticed any field rotation with my expoures of up to an hour at f/10.
>I'll take a closer look at my negatives though.

There may well be, but I don't know it. Look at the stars farthest from
your guide star. Are they perfectly round, or somewhat oval? If they are
oval, you may have some field rotation.

Robin Casady
http://www.scruz.net/~rcasady/

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