RE: [APML] Drift alignment problem - wedge mounted scope

["Gene Horr" <genehorr@houston.rr.com>]

Could it be mirror flop?

On MAPUG it has moved.  If you go to the Topical Archives page they have
a link to subscribe on the new server.

Gene Horr


> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of Bradley
> Sent: 07/27/2005 3:38 PM
> To: Discussion of Film Astrophotography
> Subject: [APML] Drift alignment problem - wedge mounted scope
>
>
> Afternoon, everyone;
>
> I seem to have a rather curious problem doing a drift alignment
> for a Meade
> LX200 mounted on a wedge. When adjusting the azimuth (+/- 10-15 degrees of
> celestial equator - +/- 30 minutes of meridian) I can adjust
> until I get no
> observable drift in excess of 10 minutes, at -10 degrees
> declination..but if
> I move it up to +10 degrees declination I have a fair amount of drift
> showing up again..less than 3-5 minutes. If I adjust to correct for
> this..then move back to -10 degrees declination..drift is again back. Yes,
> it changes direction..if I adjust east, for example at -10 degrees to
> correct..then move to +10 degrees the adjustment is west to correct.
>
> Am I missing something? Once it's been aligned it shouldn't
> matter whether +
> or - declination..should it? I do know that when I did a drift alignment
> using +20 degrees, I had a lot of field rotation showing up. Back a long
> time ago when I aligned using approximately -15 degrees I wasn't
> seeing any
> field rotation.
>
> Right off the top of my head, I'm guessing that if the OTA isn't aligned
> properly with the fork arms, it might cause something fluky like
> this..maybe?
>
> Thanks for any input.
>
> Bradley
>
> Thorn Garden Observatory
> http://astronomy.thorngarden.net
>
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