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Monte - is Tpoint worth it in your view? I went for the far cheaper MaxPoint.
Phil,
Leveling absolutely isn't needed for tracking - with pointing I believe it might be affected on start up by how your hand controller models its sky version. More precisely for pointing lets say the hand controller maps a triangle of three well spaced reference stars onto the sky - that's all you need right? Originally I thought so, until I pondered does it map those 3 stars from a an absolute or relative position? If its absolute - based on assuming a perfectly level mount - things could go awry - if its relative (gear position only) - you have no worries.
Without knowing which sky model is used its hard to say definitely leveling is essential. Certainly with smart enough mathematics - and storing all essential modeling variables - a flat base wouldn't be needed. If your modeling assumed a level mount and didn't store assessed level of the mount you could experience what I see.
So I have at least two variables 1) level and 2) SCP mis-alignment and 3) if you also count backlash which could be playing a part - although I have almost perfect backlash on RA and only a little amount in DEC.
More experimentation is needed - I'm tracking in on a solution.
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