Re: [APML] STV or ST7E for guiding?...

["Jim Janusz" <jjanusz@dc.rr.com>]

Hi Alan,

I was a pioneer with the ST-V during a time when the firmware had problems.
Even after SBIG released updated firmware I continued to experience
intermittent guiding problems which were primarily oscillations of one axis.
I would routinely spend 30 minutes or more messing with the -V parameters
and still get oval stars.  Something I have never had with either the ST-4
or now the ST-237a and Maxim.  IMO Maxim solves this problem by giving you
control of the min / max move in each axis and by control of the pause
between corrections in each axis.  My AP1200 will guide better unguided than
I could get the ST-V to guide.  Ray Gralak's Pulseguide allows me to take 10
minute exposures (sorry CCD) unguided.  To be fair many imagers use the ST-V
successfully but I was not one of them.  My Losmandy GM200 had the same
problem with the -V but not the ST-4.

If you need more info feel free to email me off list.

Jim
----- Original Message ----- 
From: "Alan Voetsch" <alanv12952@yahoo.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Friday, May 07, 2004 7:12 PM
Subject: Re: [APML] STV or ST7E for guiding?...


> Hey Jim,
>
> --- Jim Janusz <jjanusz@dc.rr.com> wrote:
> > ST-7 and for me it guides much better than the -V.
>
> Can you extrapolate on that a little? We always hear about the 1/30th
> pixel guiding accuracy of the STV. Wonder why the 237 does so well for
> you.
>
> Right now I use a 201 on my LX200, and an ST-4 on my G-11, but have
> been thinking about possibly upgrading one of them. Of course, I know
> it's hard to upgrade a 201, but it might be worth a shot. 8-)
>
> Thanks,
> Alan
>
>
>
>
>
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