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Message: <blockquote data-quote="BF Hammer" data-source="post: 825818" data-attributes="member: 48483">Switch off AF as soon as you have it where you want. Infinity focus is good for the entire night sky.My focus process is to pick a bright star, zoom the display in as far as it goes and manually adjust until the star is as tight of a point as can be. That is infinity focus. Then aim on target, hands off the focus ring.Quick note about a dew heater: they run about $25-$35 on Amazon. I use a 20V power tool battery with a power tap attachment. The tap has 2 USB ports and a 12V coaxial jack that I use to power my star tracker. A simple power-bank phone charger can power the dew heater easily if you don't need the 12V. Stuff to consider.</blockquote>