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CA in a 150mm f/8 is no big deal. I know someone who has one, had it for quite some time and makes no mention of CA issues. More of an issue is the length of the tube and being low when the object is high.
I was using a 120mm f/5 refractor for quite some time and found it passable on planets although on the bright stars the purple glow got people interested as to why; a filter can help cut down its intrusion.
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