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Re: CD5 Saturated Sources again
> ...they have a "cross" pattern as a background
> that is darker in the corners. I think THAT is coma spreading the
> background out at the corners.
Here's what I think. Fire away if you think I'm wrong.
I don't think coma would spread out the background. Assume that the
background is made up of a large number of point sources. Each
point would be imaged as a coma but they'd all overlap. You'd have
the same amount of total light.
If the image scale changed as a function distance from the center
(pincushion/barrel distortion) then I would expect the background
to vary because the density of those point sources depends on the
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