[pmrid (Peter)]

Zoom into the attached. The stars are all like little oysters.

This is new. The camera is an ASI533MC Pro. I've used it without any issues on m 94EDPH SharpStar scope but NOW, when I use it on a brand new scope in it's first light trials, I am getting these artifacts.

Focusing is as good as I can make it. The guiding likewise. Seeing mediocre.

The new scope seems likely to be the villian. I have tried it with other camera - ASI071MC and ASI1600MM.

The scope is supposedly an APO made and sold by ZWO. These artifacats appear whether I use their proprietary Reducer (X 0.7) or not. It does seem the only other element is the filter - an Optalong L-Enhance - but I have used it on the SharpStar scopes without these issues.

The AOP is supposedly a quad and according to the blurb should be CA free.

Any suggestions?