Re: SBIG 2000xcm slipping on back of ZS 80mm
- Very nice - awesome pic and glad the focuser replacement worked out for you
--- In William-Optics@yahoogroups.com, "ka4gbr@..." <ka4gbr@...> wrote:
> Hi All,
> William was nice enough to upgrade my focuser for free.
> Thanks William.
> The upgraded focuser has zero image shift and holds the weight
> of the telescope with no problem.
> Took it out last night and took 2 hours of Luminance of Markarians Chain with my GTF-81. Had to use an IDAS filter because I live in a White zone.
> --- In William-Optics@yahoogroups.com, ka4gbr <ka4gbr@> wrote:
> > I have a GTF-81 scope.
> > I am thinking about replacing it with a feathertouch focuser if they have an
> > adapter for it.
> > The DDG focuser can hold the weight ok but it has some focuser shift when
> > focusing.
> > Ray
> > ________________________________
> > From: notgnirramot <notgnirra@>
> > To: William-Optics@yahoogroups.com
> > Sent: Fri, April 26, 2013 12:31:08 PM
> > Subject: [William Optics] Re: SBIG 2000xcm slipping on back of ZS 80mm
> > Â
> > I replace the Focuser on my Megrez 80 Fluroite with a Moonlite motorized Focuser
> > and it wors great with my ST8300, filter wheel, and reducer/flattener IV. The
> > Focuser that came with scope behaved as you describe.
> > I would recommend the Moonlite Focusers.
> > Good luck.
> > Tom
> > --- In William-Optics@yahoogroups.com, "lovechina61" <lovechina61@> wrote:
> > >
> > > I have an older model ZS 80mm that I have mounted piggyback on my LX200. The ZS
> > >80mm's long focusing tube just slides way out backwards when I point the scope
> > >towards the zenith. Luckily, there is a catch which prevents the focusing tube
> > >and camera from falling to the ground.
> > >
> > > I have tightened the small tension screw as much as tightly as possible but it
> > >just keeps happening. Perhaps I can bore out the original tiny tension screw and
> > >then put a more heavy duty screw in its place? But then I would have to
> > >carefully weigh just how much to tighten it cause I don't want the focusing tube
> > >to continue sliding yet I also want to make sure the focusing tube has a little
> > >freeplay in it so that my Rigel focusing motor can still budge it along during
> > >its focusing routine.
> > >
> > > What are some other options (besides getting an entirely new scope)? Have some
> > >of you been able to lock the focusing tube into place but then mount another
> > >adjustable focuser to the back of the refractor? If so, please let me know what
> > >focusers you are using. Of course, whatever focuser I use needs to be strong
> > >enough to handle the weight of my SBIG 2000xcm without slipping even when I am
> > >pointed at the zenith.
> > >
> > > Mike
> > >