ABE is where you need to select an area that is supposed to be the closest to black like the sky.
My images have the nebula filling my pictures, so there is no area that is really 'black' like the sky around the nebula.
So I picked the 'darkest' area that I could find.
Well, after all was said an done, the resulting pictures looked pretty poor.
Since the nebula fills my picture, should ABE be skipped?