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The faster the shutter speed the better, so that less atmospheric turbulence
is captured. ISO800 is fine, you won't see any significant noise in such a short exposure. Take several at around 1,000 sec ISO 800, fine tune the exposure by increasing or decreasing the shutter speed. When you are happy with the exposure take a dozen or so, and select the best one. The 1,000 is only a
guide, the shutter speed required will obviously vary widely with the phase of the Moon.
raymo
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