I would also add that after I did a 300 point super model in Sky X and turned on Protrack corrections I got even better guiding results than simply autoguiding with PEC on. So now I use PEC and Protrack in my guiding and I get better results.
I think though a periodic redo of the model may be required if you change cameras with a resulting slight rebalance etc. Its a bit like taking flats. If you change anything the model may go off.
Greg.
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