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Originally Posted by davidpretorius
Imaging experts, is this where a "flat" is required with the light more pronounced at the bottom of the image.
I am enjoying these!
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Dave,
Don't know about the expert bit, but what you are seeing called a gradient. I can be due to light pollution, the moon, or the sun coming up! Flats will not correct it. Flats are for correcting illumination problems within the optical system.
You need a gradient remover, like Russell Crowman's Gradient Exterminator, or the new ABE from Carlos Milovic.
Cheers