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Richard,
Yes you have it right. For both the 200mm and 300mm, the default image plane is a long way out from the tube, thus it needs a bigger secondary. I fixed it on the 300mm with a bigger secondary (the focal plane was in the perfect spot for my camera/corrector combination).
On my 200mm version, I moved the focuser + secondary down the tube a bit to fix the problem.
James
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