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I think Les’s estimation is very close. Of course individual eyes may detect slight variations lower than this. But this will be very subjective.
I have spent time comparing the views through 140 and 152mm refractors and could detect only a very slight increase in brightness in the 152mm scope. Here the difference is 18% and one had to spend time looking for the difference.
Last edited by Tinderboxsky; 08-10-2019 at 08:35 PM.
Reason: Correction
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