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Unless the tester had resources most of us can only dream about, the sample size of each telescope tested was probably be very limited, down to a lower limit of 1. Does anybody have any info on whether those manufacturers or retailers that quote Strehl figures include any information on variability e.g. standard deviation. It's nice to know, but realistically on how many nights does the seeing allow any of use to really test the limit of what our optics can do.
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