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Hi Mark,
If you are going to the trouble of creating a TPoint model, then that means you
are interested in refining your whole-sky pointing performance, in which case,
those that responded to you with the suggestion that you would require two models
are absolutely correct.
Technically more specific, some pointing terms are a function of the optical axis
of the scope. A classic example of this is CH, which is a measure of the amount
of non-orthogonality between the optical and Dec axes. CH can even change from
session to session should you do something as simple as re-attaching a camera.
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