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Thanks Bojan I'll look into those.
Another thought occurs to me that using the method of finding the centre of rotation, one could position the camera anywhere including the normal guide camera position. The camera would need to be pointing close to the pole and the dec axis could be used to collimate, so the centre of rotation is in the centre of the camera FOV. Cone error adjustment may also be required.
The the overlay can be centred on the FOV and the BQ Oct asterism used to align as before.
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