Quote:
Originally Posted by A23649
Are you taking Flats?
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This is most likely your problem.
Moon/skyglow won't cause a spherical gradient. Instead you will get a gradient affect to one side (whichever the moon is on).
Did a quick and dirty combine of some subs taken from my back yard. Not flats applied or post processing done (apart from histogram transformation to show the affect).
You can see the spherical glow, and to the top right is a green gradient from the corner. The green is sky glow from Brisbane city and the spherical glow is normal as this has no flats applied.
Apply a flats to the subs and the spherical glow disappears, you can then use a gradient removal to remove the green sky glow.
PS: Full moon doesn't help, but you will still get images they will be washed out a bit though and won't look as good as if they were taken during a new moon. If it is a full moon i generally tend to image something that is on the completely opposite side to which the moon is so i don't get reflections.