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Hi Mark,
I've seen the same 'effect' with ZWO OSC and Mono cameras with different filters. It only happens on very bright stars and is not consistent, i.e., might be there one night and then might be gone for a while.
I haven't been able to find the root cause, but from testing with different parts of the imaging train, I suspect it is caused by a combo of the filter and/or the camera protection window.
If you try and rotate the filter or turn it around, or rotate the camera, then the effect might be reduced or be gone.
There are discussions on CN with people reporting similar 'effects', but I don't think anyone has gone to the bottom of it.
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