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It is very simple folks. The sensor is sensitive to far IR. Your standard Bayer matrix colour filters will pass IR. If you remove the filter designed to give the sensor the same colour sensitivity as human eyes (this attenuates the HA by a factor of about four or five) it will be sensitive to HA and far IR and so bloat your stars as your optic will not be in focus for that wavelength.
You must put a decent UV/IR antireflection coated filter that allows HA through but not far IR. As for colour balance after this there are filters available from Hutech or use AWB or PS.
Feel welcome to ask any questions and if I know the answer will try to help.
Bert
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