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Reflections from reducers or flatteners sounds like a lack of good antireflection coatings on the lenses.
Also bright stars outside the view is caused by a lack of good baffling.
You may be able to sort out the later with a round baffle to reduce the diameter of the flattener. The reflections also may be from filters if you are using a mono camera and filterwheel. You may need to get better filters that have the latest antireflection coatings.
Greg.
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