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Don't overlook QHY5L-II, the mono version has a very sensitive chip.
They come in 1.25 barrel fittings, so can fit into a "standard" OAG.
RE ED80, I use the Orion Flattener/Reducer attached to my DSLR and found that I can get focus around the 35mm mark on the drawtube.
Hope that helps.
Bo
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