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Old 05-12-2011, 11:41 PM
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gregbradley
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Join Date: Feb 2006
Location: Sydney
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I am not sure if this may affect it but the manual for the Sky X seems to indicate you need to do a synch after every power on. Its a little unclear on this point. I also though per the T-point manual that if you did a synch you had to do a new model. I'd have to read it again.
I don't know if this is a change with the Sky X but I suspect not.

But I was just doing as Rally was saying and after the synch the go-tos were on the star or really close by. I was putting together an initial T-point model on the PMX. This though is with an AP140 and reducer and about 750mm focal length.

I haven't been synching every time I turn on the mount. It appears you are supposed to. Is that something you have been doing?

Greg.


Quote:
Originally Posted by Paul Haese View Post
Rally, I got the figure from the Tpoint model which says 12.2 arc seconds after 74 points.

With the TSA I get very accurate pointing. Typically only a few seconds ( what looks like a mill or two on the screen) at most from the cross hairs to the target.

Time I did a sync around 5 pm with my usual server. I doubt that would make much of a difference.

Yes sub 10 second pointing at 10 points, I get around 4" from 10-20, then as it gets further into the model is blows out a little to around 40" prior to adding terms. Once terms are added it get more accurate and I follow the significant differences ideas we have discussed in the past (ie watching the sigma etc in the model).

PA looked fine after 20 points and the mount has not moved since my Tpoint run on the TSA.

Since Greg gets a similar result I suspect that focal length does influence the pointing accuracy, so I will hunt down what is flexing if anything.
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