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... and if you want to know what you are seeing at the eyepiece of your telescope (really important for IDing deep-sky fields), then software like SkySafari (app for iPad) or Stellarium (free program for your laptop) become invaluable. My SkySafari Pro goes down to 15 mag (or so - a few gaps), and therefore almost always shows all the stars visible to my eye in the 8" SCT.
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