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

[Éder Iván <eder@prof.hu>]

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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