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I had a check of other images I have done with different scopes and the Proline and the Microline and I can those spikes subtley on some brighter stars even with refractors.
So as you say a minor thing with the FLI cameras. I would put it down to the choice of CCD chamber window glass type (they do have different types as options), antireflection coatings they use or something in the CCD chamber that could be darker and is shiny. I don't see them with the Apogee U16M images.
It doesn't worry me either way but answers a question I had about why they were there.
An aperture mask may handle it then again if its the window it won't.
Greg.
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