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I use Live View on my Canon, and all my best pin sharp lunar images
were taken at around ISO 1600 and around 1/3200th sec. DSLRS suffer
from both mirror and shutter vibrations, and as I can't lock up my mirror,
I use very high shutter speeds so the shutter opens and shuts before the vibrations can really get going. I have never yet managed a truly sharp
lunar image at lower shutter speeds. I use the high shutter speed, and get the right exposure by varying the ISO. Sort of back to front, but it works.
raymo
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