Re: [APML] Southen sky wide-fields

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

Thanks Axel! I will continue to watch for them - I have a regular SP and
love it but a beefier SP-DX would be a treat to own. Mine too has a fair
degree of dec backlash and I polar align with the polar scope only (as
you say, it is very accurate). Over about 5 min I will detect the dec
drift then move the guide star back and then I rely on that action to
soak up the backlash and away I go guiding manually. For piggyback only
of course. Wouldn't do that for prime focus but I use my G11 for that
and am only getting started in prime focus anyway. Thanks again!

Stuart
http://www3.sympatico.ca/stuart.j.heggie/Stuart.J.Heggie/
Flesherton, Ontario, Canada

----- Original Message -----
From: "Axel Mellinger" <axm2@canopus.physik.uni-potsdam.de>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, May 29, 2004 6:58 PM
Subject: Re: [APML] Southen sky wide-fields


> On Sat, 29 May 2004, Stuart Heggie wrote:
>
> > You are the only person I know of using a SP-DX mount - is it as
good as
> > I'm told? Great story about the water tank too!
>
> Stuart,
>
> thank for your nice comments! The SP-DX is a good mount, although its
> maximum load is of course limited. Piggyback shots up to 135 mm need
> hardly any guiding corrections (if the mount is accurately polar
aligned).
> The polar viewfinder is very precise.
>
> Backlash in Declination is quite substantial, and using an ST-4
autoguider
> requires a few tricks (such as switching the Dec. speed to 32x for a
few
> seconds during calibration).
>
> Clear skies,
>
> Axel
>
>
> --
> Axel Mellinger
<http://canopus.physik.uni-potsdam.de/~axm/astrophot.html>
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
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