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Reflectors don't suffer from CA when used for prime focus imaging, only
occasionally when using a poorly corrected eyepiece for visual or eyepiece
projection.
Atmospheric dispersion ranges from non existent to appalling, depending
on the climatic conditions at the time, and typically decreases as you go
higher in the sky. Are you getting this problem consistently every night?
A quick test would be to take a quick snap low to the horizon, one at around
45 Degrees, and one overhead. If it is atmos disp the effect should vary greatly between images.
If they are all the same, then you have a different problem. You could also
repeat the test facing in the direction of the new lights, and then 180 degrees from them, and see if they vary. The more data, the easier it will be to find a definite answer.
raymo
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