Re the hand controller, I'm with Greg. I have never used the MX without the HC connected (I must have missed the directive to remove it) and have yet to experience a T-Point problem attributable to it. I always use it to centre the initial calibration stars or the initial sync star if I haven't disturbed the OTA. I did a 350 point model 3 days ago with only one 'not enough stars' error when a cloud intervened.
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With a good model I don't think you will have much trouble going 10 min unguided with the focal length you are using.
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I'm not very knowledgable about imaging etc but I don't understand how a good model can affect unguided tracking. Polar alignment and PEC, definately, but doesn't the model only allow greater accuracy for the slews? Sorry if it is a noob question but these forums are my only source of education in this area.
OK, I see another thread that suggests Protrack is derived from the model!
Charles