Quote:
Originally Posted by TrevorW
A considerable amount of noise is generated when taking longer exposures over several subs I assume that you also need to take darks and lights of the same exposure time etc to remove the bad from the good pixels.
Is there a ratio of the number of dark/lights to subs required to reduce noise or is it a case of more the merrier.
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That could depend on what software you would use to calibrate and stack but ideally 5 darks for one light sub. I usually stack together 30 flats for the master and you'll need bias frames also for proper flat fielding .