Just to add my 2 cents worth.
You also get purple fringing in the brighter stars with Canon 5D2 + certain lens and aperture combos. It's pretty evident with the Canon 24 1.4 II and 85 1.2 below f/2.8, less so but still there at f/2.8. With the Nikon 14-24 + adaptor @ f/2.8 it's pretty much gone.
I normally fix it by reducing the 'purple' saturation in ACR.
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