Quote:
Originally Posted by DavidU
Wasyoung, here is a typical longitudinal map of RBG (a triplet APO)) trace that shows the blue is a little out of focus while the red & green are.
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I got an interferometer report with my scope..FWIW. I don't/didn't expect APO quality but IMHO it's behaving like an Achromat.
I'm manly concerned that the flare is across the field & not concentric with the stars..but biased badly to the upper right side of stars.