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Seems to me the luminance might be a problem. Yes, you could add RGB to get a synthetic Lum channel, but it seems to me (in my limited experience) that the best images have very long luminance exposures and even use binned 2x2 for colour. So, yes it seems possible to get an in focus colour image from an achromat, but would it look as good, or as deep, as an APO considering the lack of in focus luminance?
Peter
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