Hi Chris,
Thanks for the reply and information. I know that there aren't any gears
in the focusing mechanism of the Classic LX-200. What I was trying to say was
that I have an older LX-200, and was hoping that the manufacturing would be
better on it and not need as much backlash compensation.
I think the step size and backlash information you gave is the
information I need. I do plan to go back to FocusMax, once I get it
reconfigured. My mouse finger got faster than my brain while I was cleaning out
my hard drive a couple months ago and I managed to delete my FocusMax
configuration files and can't seem to get it to configure again.
Tandy W. Carter Jr.
carter646831@
http://home.
> -----Original Message-----
> From: sct-user@yahoogroup
> Chris Peterson
> Sent: Friday, February 08, 2008 10:23 AM
> To: sct-user@yahoogroup
> Subject: Re: [sct-user] Re: RoboFocus settings
>
> > I have an older classic with metal gears, so I hope not to have as
> > much backlash as people with newer classics.
>
> Not sure what gears you're talking about here... there aren't any in the
> focusing mechanism. AFAIK, classics have always used a plastic thrust
> bearing (basically, just a washer) between the focus knob and scope
> back, and this is a major source of backlash. You can considerably
> improve the focuser by replacing this washer with a roller thrust
> bearing. There's an expensive kit you can buy, or you can do it with
> hardware store parts for a couple of dollars.
>
> I use FocusMax (which I'd recommend you switch to), so I can't comment
> on @Focus settings. But for my RoboFocus settings themselves, on a 12"
> classic LX200 with the focuser mod mentioned above, I use a step size of
> 4, 250 steps of backlash compensation, and I finish in the "out"
> direction (mirror pulled back). For smaller LX200s you need to finish in
> the "in" direction (mirror pushed forward). The direction you finish is
> very important.
>
> Chris
>
> ************
> Chris L Peterson
> Cloudbait Observatory
> http://www.cloudbai
>
>
> ----- Original Message -----
> From: "carter646831" <carter646831@
> To: <sct-user@yahoogroup
> Sent: Friday, February 08, 2008 7:55 AM
> Subject: RE: [sct-user] Re: RoboFocus settings
>
>
> > Hi Leo,
> >
> > Thanks for the response, and information. I always like people's
> > answers. ;{) I have an older classic with metal gears, so I hope not
> > to have as
> > much backlash as people with newer classics. The numbers you're
> > reporting are
> > very close to what I use. I use a total travel of 65326 and backlash
> > of 50. I
> > have my @Focus set for a small step of 1 and large step of 10 and no
> > backlash I
> > use 50 iterations and averaging of 3. The seeing in Northern Florida
> > is very
> > soft also. I think what I'm looking for is the step size in the
> > RoboFocus to get
> > the recommended 1/2 CFZ.
> >
> > The algorithm you use is very close to the algorithm the RoboFocus
> > manual says to use. I like your idea of starting from set points in
> > RoboFocus.
> > Once I get good starting points, I'll go that route. I may use a
> > combination of
> > both methods. Start with the focus point in RoboFocus and then use
> > either @Focus
> > or FocusMax to get the fine focus.
> >
> > Tandy W. Carter Jr.
>
>
>
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