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RE: [APML] OT: St-4 -help!
Gene, do you have any idea why the backlash compensation doesn't work for me?
Thanks
Ivan
At 22:28 2005. 09. 18.t Conve, you wrote:
>No. That system is about as stable as it gets.
>
>Gene
>
>
> > -----Original Message-----
> > From: astro-photo-bounces@seds.org
> > [mailto:astro-photo-bounces@seds.org]On Behalf Of Ider Ivan
> > Sent: 09/18/2005 3:18 PM
> > To: Discussion of Film Astrophotography
> > Subject: RE: [APML] OT: St-4 -help!
> >
> >
> > Thanks, I will try it!
> >
> > BTW Is it possible there is a bug in the st-4 software?
> >
> > Ivan
> >
> >
> > At 22:03 2005. 09. 18.t Conve, you wrote:
> > >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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