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My CDK17 had a lot of stray light reflections from out of field bright stars. Planewave developed this aspect of the scope for a while with a different secondary shroud (that has a slightly triangular section to it), extra baffles that they supplied including a fairly large one around the primary mirror tube (about 30mm wide).
That's what it seemed to take to stop the problems. It does not seem to be an issue anymore but I was surprised at how many baffles, bits it took to handle it.
I also got improvements by blackening some areas in the light path. Black anodised aluminium is reflective so it should be blackened as well.
Greg.
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