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Hi Martin,
Have you got this distance correct from the CCD to the back of the Focal Reducer? If this is out you will still get coma. What camera are you using?
I was using a Canon 350D with my old LX200 and f/6.3 Focal Reducer and the applied distance from the Cmos/CCD to the back of the FR had to be close to 105mm.
Paul
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