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Hi Rally. no argument from me overall, but there are two points that possibly need clarification:
1. shot noise from the sky is the main source of noise - the average sky signal itself is a nice pedestal that can be just subtracted - it is only the shot noise part of the sky signal that cannot be easily removed.
2. this discussion is about exposures for subs, not the total overall exposure. clearly, longer overall exposure is always better - it is just longer subs that may be a waste of effort.
Last edited by Shiraz; 30-10-2013 at 07:31 AM.
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