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Glare from a bright star just outside the FOV is pretty much what I am talking about as well. The CDK would sometimes show that glare from these bright stars.
How the baffle is implemented and how wide it should be and where it goes is a matter for the manufacturer to advise really. I just know the CDK one worked quite well, so much that I ended up not installing one of them that was meant for the corrector (2 went there and I only installed 1).
Reflections are always possible but a neat arc like that? I got a reflection off an adapter when I used an AP reducer on my AP140. It looked like a spiral galaxy at an angle. That was from a reflective surface on an anodised part but it wasn't an arc nor anywhere near that large.
Greg.
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