Quote:
Originally Posted by evltoy
Why could you not take 2 different exposure times from Luminance?
20-30sec subs to retain star shape
60-180sec subs for detail.
In pixinsight you could just use the stars of the 20-30sec subs and remove the stars from the longer 60-180sec subs and use just for detail.
Could this work?
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The answer to your question in principle is yes depending on the target but ….,
Unless your skies are dark or darkish ( Bortle 1 to 5 ) I doubt whether you can shoot Luminance subs longer than 60 sec before the noise floor becomes too overwhelming and the detail becomes swamped or saturated.
At my B3 South Coast location, 60 sec to 120 sec subs ( target dependant ) are the sweet spot during New Moon.
In Sydney under B8 Skies 20 sec to 30 sec for Luminance are about as long as I can push before struggling with too much gradient or sacrificing detail.
The only way to find out is test and experiment with your gear , imaging location and specific target !!!
Martin