Re: [APML] Comet Exposure Questions

["GARY HATFIELD" <Starmangmh@msn.com>]

Ok, thanks Ulrich!

 

Gary

----- Original Message -----

From: Ulrich C. Beinert

To: 'Discussion of Film Astrophotography'

Sent: Sunday, January 09, 2005 12:54 PM

Subject: RE: [APML] Comet Exposure Questions

Hi Gary,

> Thanks Wade.  Since I have no way to guide on the comet,
> how would those times transpose to guiding on a star (prime
> focus), or for piggyback?

They should be the same. It doesn't really matter what's moving - the
stars because you're guiding on the comet (or not guiding at all), or
the comet because you're guiding on the stars. Whatever is moving can't
move more than a certain amount before you can see it. That amount is
the same for everything. So guide on the stars for the times Wade
figured out, and you shouldn't see the comet moving, either.

Ulrich

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