Just wanted to add one further thing. The incident of internal reflections is fairly high in this OTA. I moved Canopus from one side of the field to the other and when I was around 10mm from the apparent edge of the field there were internal reflections visible. I thought the baffling was supposed to prevent this from happening. Although I thought I read read that Jase had similar problems with his RCOS and internal reflections. I might well have been the EP design that was causing this, but it was definitely there.
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