Hi Colin,
To my understanding, the darker the skies, the cleaner the camera and the brighter the object the shorter the subs to get a good SNR. And inversely, with light polluted skies and with a noisy camera and when imaging a dim object exposures need to be much longer to achieve the same SNR. Or am I missing something obvious?
So the optimum exposure times should vary for different DSOs even for the same gear.
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