RE: [APML] OT: St-4 -help!

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

I would just leave the "H" settings at zero and
try averaging 2 exposures.

Gene Horr


> -----Original Message-----
> From: astro-photo-bounces@seds.org
> [mailto:astro-photo-bounces@seds.org]On Behalf Of Ider Ivan
> Sent: 09/18/2005 2:32 PM
> To: Discussion of Film Astrophotography
> Subject: RE: [APML] OT: St-4 -help!
>
>
> Thanks, Gene.
>
> I have a Synta EQ6.
> In RA, there is no problem, everything works perfectly.
> I used 1 or 2 sec exposures and dim stars for guiding and a
> 70/500mm guide
> scope. When I stopped tracking, and manually guided with the main scope
> there were no need for correction in DEC for at least 5 minutes, at 300x
> power. The error was less than 1" (in DEC).
> What parameters do you use guys, to avoid false corrections in DEC?
>
> Thanks:
> Ivan
>
>
> At 20:46 2005. 09. 18.t Conve, you wrote:
> >What kind of mount do you have?  If everything is set up correctly
> >you shouldn't need the backlash compensation.
> >
> >In RA you should be guiding with less than 1X siderial corrections.
> >Since the gear never reverses there should be no backlash.  The
> >motor is merely speeding up and slowing down.
> >
> >In DEC the corrections should be very rare, compensatiting
> >for system flexure or a slight bit of drift.  If you are
> >continually changing directions you are chasing seeing.  In
> >that case you would need to either increase your exposure time
> >or use averaging.
> >
> >For most systems the flexure is so slight that having to wait
> >a couple of cycles for the DEC worm to move to the other side
> >does not affect the final image.  You might want to try leaving
> >a slight imbalance in DEC in order to keep the gears loaded to
> >one side.
> >
> >Try it with a slow correction speed and no backlash compsensation.
> >You should get better tracking.
> >
> >Gene Horr
> >
> >
> >
> >
> > > -----Original Message-----
> > > From: astro-photo-bounces@seds.org
> > > [mailto:astro-photo-bounces@seds.org]On Behalf Of Ider Ivan
> > > Sent: 09/18/2005 11:50 AM
> > > To: Discussion of Film Astrophotography
> > > Subject: [APML] OT: St-4 -help!
> > >
> > >
> > > Hi Guys!
> > >
> > > Several weeks ago I had purchased a brandnew(!) st-4 autoguider.
> > > I'm in the
> > > learning phase still, but I have an uncovered problem with the camera.
> > >
> > > There is a problem with the backlash compensation, which seems to
> > > works not
> > > properly.
> > > The problem is: when st-4 change the direction in Dec, it applies the
> > > increased correction time (due to H2 setting) TWICE, resulting a
> > > completely
> > > false correction.
> > >
> > > Does anybody has any idea what might be the problem?
> > >
> > > Thanks:
> > > Ivan
> > >
> > >
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