Alistair, great idea! A pic of the tube setup would be helpful.
Re your Pempro results, that does surprise me. I've heard of people using very complex PA modelling programs (e.g. like SkyX) involving hundreds of all sky points, only to return to Pempro b/c the results are so trustworthy. AP mount users swear by it, as they should - it comes bundled with the mount.
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