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That looks like you've zoomed in enormously, right?
Accurate dark subtracts with enough subs in the master dark at the same temp and exposure length should take care of noise. My FLI ML8300 at 1x1 10mins and -40C seems extremely clean. But if I zoom in 500% I see some black specs. They don't affect image quality.
Greg.
Last edited by gregbradley; 07-10-2014 at 09:34 PM.
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