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It's been a while since I've observed them but you do need a stable atmosphere. I recall the 4 largest craterlets being very easy to spot in a 10" scope, with another 1 or 2 visible as well when Plato is near the terminator. I also recall seeing the largest craterlets during a full moon, but they appear as white spots rather than shadowed depressions. Perhaps others will chime in with more recent observations.
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