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Yes Microlens artifacts. I do not recall seeing them though with my old FLI ML8300. But that had no cover slip so perhaps its more likely then to be an interaction between the cover slip and the microlenses.
Sometimes the thickness of the sensor stack (sensor, microlenses, cover slip, CCD window etc) causes unwanted reflections.
I also wonder if the CCD window has no antireflection coatings (probably does not). FLI researched the reflection coatings on the ML8300 and improved them after one user complained I think of halos on some stars.
The microlenses though increase QE a lot so you are better off with them.
Greg.
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