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You would be doing "lucky imaging" to get around atmospheric disturbances. Basically, you take 100 images with <100msec exposure times. You check which ones were good, and discard 95 of them. Then you overlay the good ones. That would explain the high number of images taken.

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There's informed ways to increase your luck like choosing a location at the highest altitude you can, pick a night with cool crisp air vs hot summer air, be fortunate to have a storm system roll through and clear our just before you shoot to clear out the air.

TFA says he is Kurdish which would suggest to me that finding a spot in the mountains with some altitude was probably not out of the realm of possibilities.

Yes, except those numbers will be a lot higher.

81,000, so 810x higher which definitely qualifies as a lot in my book

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