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I know people who have bought a goto to learn there way around the sky and it hasn't worked. The best that happens is they learn a few calibration stars and not much else. Other times they don't even manage that. I'm afraid nothing beats a star atlas (I used Nortons) a red torch and a pair of small binocs (say 8x32) if you want to learn. There are real uses for goto but IMHO teaching isn't one of them.
As for the scope, if you can handle the 12" why not put the money you save by not buying the 5" and put it towards an Argo Navis?
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