My photograph which is set at 3600 ISO is really grainy, but when I look at other photographs of the Milky Way on National Geographic or wherever, their ISO is set to 6300 or something like that and it's not the least bit grainy! And I've tried the tools in programs that remove grain and noise; it just makes my photo look blurry, like extremely blurry and un real.
How do I combat this? I have a Nikon Coolpix p510.
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