Re: [APML]OT-Drift Alignment

["Stuart Heggie" <stuart.j.heggie@sympatico.ca>]

Serge - knowing you'll get some very expert opinion I'll offer this - drift
align till you can't stand the boredom. My attention span is not that long.
I polar align my SuperPolaris mount with the polar bore scope and run with
it but guide manually. I do end up making some adjustments in Dec but they
are not much and I've not noticed any objectionable field rotation on lenses
up to 180mm. I only use the SP for piggyback. I drift aligned my G-11 for
the observatory.

Stuart
----- Original Message -----
From: "Serge Theberge" <serge.theberge@wti.on.ca>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Tuesday, November 25, 2003 8:01 PM
Subject: RE: [APML]OT-Drift Alignment


> I have been told that for astrophotography, not only you must have a good,
> sturdy mount, but you must have good polar alignment.  I have seen various
> rules of thumb about what is "good enough" polar alignment such as no
> visible drift @ 200X for 5 minutes, others state 15 minutes, etc.  My
guess
> is that there must be some kind of formula (or rule of thumb) linking
> "maximum acceptable polar alignment error" to f-speed, magnification, film
> grain size, exposure duration, etc.  Can anyone enlighten me on this?
>
> Thanks
>
> Serge Theberge
> Toronto Centre
> RASC
>
> > -----Original Message-----
> > From: astro-photo-bounces@seds.org
> > [mailto:astro-photo-bounces@seds.org] On Behalf Of Franklin A. Holub
> > Sent: Monday, November 24, 2003 4:25 PM
> > To: Discussion of Film Astrophotography
> > Subject: Re: [APML]OT-Drift Alignment
> >
> >
> > I haven't posted in a while but lets see if I can really mess
> > things up... I'm going to make a statement that is going to
> > fly in the face of years of experience and is going to
> > contradict what we have always been told about drift alignment...
> >
> > But first, a little background...
> >
> > After a couple of years of being happy with "close enough"
> > polar alignment, I installed a perminant pier and I figured
> > it was time to "nail" my polar alignment. <snip>
>
>
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>

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