With my skies I can rarely get above 200x on the planets. Only once in the year I've owned my 12" I was able to use 538x on Uranus, but that was ONCE since April 2010 when I picked the scope up! Most of the time 200-250x is the best you'll get with typical seeing conditions, according to my experiences anyway. On a bad night you might be limited to 150x, as a matter of fact I've seen nights when stars were bloating and fuzzing at just 60x! Don't worry, such horrible nights are as rare as the good ones!
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