Quote:
Originally Posted by RickS
I suspect that the wings of the PSF are a much greater factor in this than out-of-band light.
Cheers,
Rick.
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True, nonetheless I had noticeably but not vastly larger halos with my ED doublet than with the current triplet (same user :-), camera, same 3nm n LRGB filters, location, aperture and similar f-ratio). So I suspect an achromat would give inferior RGB/narrowband data relative to an ED doublet at same f-ratio, not to mention a well corrected triplet
