Your comments about the Cannon 75-300 made me smile because that's exactly how I feel about my Nikon 70-300 :) You're probably right about choosing a faster shutter speed, but I'm not sure how to calculate this. There is a formula... I know that for 24mm on a full frame camera I can shoot the sky at up to 15 seconds, but at 20 seconds I can see the beginning of star trails. At an effective 480mm for the moon, 1/500 or faster sounds right to me.
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