Quote:
Originally Posted by rustigsmed
Applying flats have been the most useful addition to my pics, they make the biggest difference to an astrophoto in my view.
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I totally agree. From my limited experience, sufficient number of dithered subs treated with flats(*) and complemented with skilful processing will result in achieving quality images, of course given accurate guiding, sharp focus and good optical alignment of all components.
I feel that dark-subtraction is often overestimated in its impact on improving the final result. For this very reason I only subtract a master bias frame from my subs and I usually try to collect about 25-30 subs through each filter.
The best thing however is to personally and objectively investigate these matters, since there are so many different setups for astrophotography and thus there is no one definite answer regarding dark-subtraction.
(*)If using narrowband filters flats become pretty much unnecessary.