After reading this when it arrived back via the mail list I realized it
wasn't clear. I changed the Cr and Cd to match the F/10 3000mm focal length
I was shooting at (I think I cut them in half). If I was shooting at F/6.7
2000mm I would leave them at the factory defaults.

-Glenn


----- Original Message -----
Sent: Friday, February 16, 2001 6:39 PM
Subject: [M]: Re: 216XT parameters for Autoguiding 12" LX200


> I've had good luck with mine on my 12" LX200. When I first started using
it
> I found that I had to place the guide star right in the center of the chip
> otherwise it would lose it during calibration. I figured later that they
> probably optimized the factory settings for the 8" SCT with a 2000mm focal
> length. Since I was shooting at F/10 I adjusted the Cr and Cd to match. It
> really helped and guiding has been gone well.
>
> Now, I've been using an old, basic Celestron off axis guider which places
> the pick off prism so far in that gets in the way of the light path to the
> film at the corner. One benefit is that the star images the guider saw
were
> pretty sharp. I have just gotten a GEG and played with it just a bit last
> fall before the weather turned. The prism is quite a bit farther out and
the
> guide star image suffers a bit. Also, if you use the focal reducer it will
> be even worse.
>
> The key to guiding with the 216 is to first find a guide star visually.
One
> that is bright enough that you wouldn't mind guiding on it manually. Next
> issue is focus. Find an eyepeice that you can make parafocal. I used an
old
> 12'' guiding eyepiece whose focus could be adjusted to match the cross
> hairs, just turned it till its focus matched the CCD.
>
> I have some photos taken using the 216:
> http://www.rca-omsi.org/rca/members/graham/graham.html
>
> -Glenn Graham
>
>
> ----- Original Message -----
> Sent: Friday, February 16, 2001 1:20 PM
> Subject: [M]: 216XT parameters for Autoguiding 12" LX200
>
>
> > Hello
> > The weekend is on its way , the weather predictions are excellent and I
am
> > a couple of months now without any astrophotography session.
> > The GEG is arrived a few months before and the same for a brand new
216XT
> > (after a couple of those fried and replaced by Meade for free - Thanks
> Meade
> > -)
> > Is anyone of you guys having a successful set of parameters for the
216XT
> > on the 12" LX200 ?. I am interested especial for the Cr and Cd time or
any
> > other
> > information can help me to make the thing to work effectively.
> > Thanks in advance.
> > George Nikolidakis
> > http://www.geocities.com/ginik_gr <http://www.geocities.com/ginik_gr>
> >
> >
> >
>
>

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