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Paul,
good thread, and I am in a similar boat to Rob, similar guidescope/camera/rings/software, with almost similar imaging scopes.
I had no problem with the 400mm guidescope and the 2160mm or 1650mm focal lengths of the Mewlon. Ditto with the 1250mm of the 10" newt. Likewise with the ED80/840, or any of the camera lenses I have tried.
Gut feeling is if you already have the 200mm lens, try it. If you get trailing/guiding errors then maybe rethink it, but if not just do it. If I had a problem with the guiding setup I currently have it would be the CA and blobby stars I get on the monitor. How it guides with these beats me.
Gary
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