I have the 190mm Maksutov Newt and am seeing an annoying issue with my stars where my stars have orange/blue fringing on them.
I can't work out what's causing this issue and would love your thoughts on it. I hope to be able to rule out the filter the next time I have clear skies, but my stars seem round which makes me think it's not a collimation issue? This screenshot is taken from the centre of the frame and I wouldn't think I would have traversal aberration that close to the centre point.
Full image train:
SkyWatcher 190mm MakNewt
Moonlite CR2 Focuser
IDAS LPS D2 filter