Folks, was almost full Moon last night and I was curious about some of the CA I appear to have in some of my DSO shots, so I took the scope outside as I figured the Moon would be a challenging target for the little scope (WO Zenithstar 71mm)...
The saved from RAW shot is on the left (native resolution), and a gratuitous stack of 7 frames on the right with a little heavy handed magic wavelets
From the raw shot, if you zoom right in you can see a faint blue ring around the outside, but doesn't look like much to me. I've noticed then when trying to focus on a star that I see more of the blue ringing effect on one side of focus than the other, so obviously I try to approach it from the less side
This scope is "what I've got to work with" at the moment, so it'll have to do either way, but is this more or less what I should expect from a doublet/ED? Or is the Moon a bad target for this sort of test? Or is the CA more evident in longer exposures?