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It's not quite as important for globs or open star clusters to have a lighter sky background, but it is pretty much essential when imaging nebulae, otherwise a significant amount of the fainter nebulosity and visible dust is lost, as
mentioned by Jon and multiweb. You can, of course, make the background too light,
and that can cause an image to lose its impact and look washed out.
raymo
Last edited by raymo; 11-12-2018 at 12:33 AM.
Reason: more text
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