Re: [APML] ST-4 and the LX200

["Kevin Wigell" <kwemail@twcny.rr.com>]

Don, I use my 10" LX200 classic for AP, but with an STV autoguider, not the
ST-4, but I believe I can still try to answer some of your questions.

You should train your PEC, as this will increase your RA tracking accuracy
and as a result the autoguider corrections should be smaller, since the
autoguider should have smaller errors to correct.

Backlash should be set to the maximum that does not cause a star to "jump"
when you change directions in declination. I usually have mine set to "40",
but the setting will be different for each LX200. If you leave the backlash
setting at zero, the autoguider may have to issue a number of corrections
before the scope will actually respond, due to taking up gear lash.

Finally, the slew setting makes no difference for AP. On the LX200, the slew
setting only affect the maximum slew speed, which is irrelevant for guiding.

I hope this helps, and don't hesitate to ask if you need more information.

Kevin Wigell
www.kwastronomy.com

----- Original Message -----
From: "ecdon" <ecdon@cox.net>
To: <astro-photo@seds.org>
Sent: Friday, December 13, 2002 16:20
Subject: [APML] ST-4 and the LX200


> Hi folks,
>              My name is Don Spencer and I am a member of San Diego
Astronomy
> Association. Over the past year, I have gotten my feet wet in
> astrophotography by shooting widefield pictures. During my last 2
sessions,
> my good friend Jim Janusz has lent me his ST-4. We have had some success,
> but the guider is always making rather large corrections. My question for
> those with an LX200/ST-4 and shooting film:
> Do you adjust any of the settings on the LX200, I.E. backlash, or PEC
train,
> slew rates?? I have just purchased a Lumicon Giant easy guider which will
> reduce the scopes f ratio which should help the ST-4. I just need to know
if
> there is anything else I need to do.
> This is a great list with wonderful people!
> Thanks again,
> Don Spencer
> http://members.cox.net/ecdon/index.html
>
>
>
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