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Colin,
The f/3 version of the RH design is extremely prone to reflections caused by off the field stars, to the point of being totally unusable without the front baffle, which is integral part of the design.
It took me a couple of extra iterations of the baffles to get my own design cured of such reflections. The extremely short tube of the RH at f/3 makes this design different to any other common astrograph. With this design you may have perfect cutoff for stars that are one to five degrees off the field and then another star that is say 6 degrees off the field, will cause a stray reflection. Very tricky instrument.
I used the Moon and an eyepiece to track down track down internal reflections. Keep moving the Moon away from the visible field and look for any bright arcs.
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