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I use the "apply image" method in photoshop. It works great unless the nebula is big.
This is an example of the gradient I get. Perhaps I described it incorrectly saying it's "on the sensor". I believe it is some kind of amp glow. Doesn't matter where I point it in the sky, it's in the same relative position with the same colours. My Nikon D70s has it bad but my Pentax K-x only has it at the extreme edges. If it wasn't for extreme stretching it wouldn't be noticeable.
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