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Graham, couple of Q?s
I am assuming these are stretched images ?
Just how far have they been stretched - most auto stretching will create a black point and a white point and stretch to fit.
So even a small gradient will produce such a horrid result, when in fact that isnt really what exists - just a small gradient.
When you say ambient light, unless you have some perfectlly diffuse light its not likely that the light source will not have a big gradient, so I would expect a gradient to appear - from reflections, from directions of original light source from shadows - particularly the camera body itself shadowing the directional light.
Can you supply a link to some of your orginal (scope attached) flats (full sized FITS with all metadata (before any processing at all) for us to have a look at.
Cheers
Rally
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