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Paul I would try out any Tak reducer you already have. Chances are it will work and have a larger corrected image circle than other types (apart from the AP ones). You'll just need an adapter to find out.
I used an FS102 F6 reducer on a 12.5 inch RCOS and it worked quite well (a bit of curvature in the outer 1/4 of the image thoug).
Greg.
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