Quote:
Originally Posted by Crushellon
Does more integration time affect high signal areas or is it just to improve low signal/background areas? The reason I ask is because when I get another chance I would like to collect more data for my HDR Orion image and I'm wondering if I should bother collecting more of the short subs as only the high signal areas from those subs are being used in the final image with the background and low signal areas coming solely from the longer subs.
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You've hit on an important idea that often gets lost in discussions about SNR. Areas of high signal achieve good SNR very quickly and additional integration time only makes a small difference. It is areas of low signal that benefit most from more integration time. This is a consequence of physics, not an opinion
You don't need a lot of short subs if you're only using the brightest areas for HDR. You do want lots of long subs if you want to stretch enough to bring out the dimmest areas.
Cheers,
Rick.