Re: [APML] Trifid at 4000mm

[Jason Ware <jtw@galaxyphoto.com>]

The FDR itself is just a geared stepper motor. The
drive base has an electronics board that drives the
motor in the right direction and speed depending on 
where the scope is pointing. The LX200 changes the 
slew rate of both alt/az motors when the hand control
is set to guide speed such that when you press "W" for
example its a true west slew as opposed to an az slew.
The autoguider has no idea its connected to an alt/az
system.

George Anderson wrote:
> 
> Really nice work Jason.
> Does the Meade field de-rotator use inputs from an auto-guider to
> determine how much rotation is needed or does it contain it's own guide
> sensor? Or does it rotate based on lat/lon and alt/az information?
> Also was the tech-pan done with H-A filtering?
> At an Fl of 4 metres and 3.5 hours exposure it is really impressive.
> 
> George Anderson
> Montreal Canada
> 
> Clear skies and good health
> 
> Jason Ware wrote:
> >
> > Meade 16" LX200, alt/az with field derotator at f10
> >
> > 2x60 minutes hypered Kodak PPF 400
> > 1x90 minutes hypered Kodak Tech Pan
> >
> > http://galaxyphoto.com/temp/jw_trifid_meade16.jpg
> >
> > --
> >  -Jason Ware
> >
> >  ---------------------------------------------------------
> >        VISIT MY ASTROPHOTOGRAPHY HOMEPAGE!!
> >     ASTRO IMAGES FOR DOWN-LOAD, TIPS, REPRINTS
> >          URL: http://www.galaxyphoto.com
> >  ---------------------------------------------------------
> >        My Other Hobby....High Power Rocketry
> >       URL: http://www.galaxyphoto.com/rockets
> > _______________________________________________
> > Astro-Photo mailing list
> > Astro-Photo@seds.org
> > http://seds.org/mailman/listinfo/astro-photo

-- 
 -Jason Ware 

 ---------------------------------------------------------
       VISIT MY ASTROPHOTOGRAPHY HOMEPAGE!!
    ASTRO IMAGES FOR DOWN-LOAD, TIPS, REPRINTS
         URL: http://www.galaxyphoto.com
 ---------------------------------------------------------
       My Other Hobby....High Power Rocketry 
      URL: http://www.galaxyphoto.com/rockets
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo