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The vmc scopes do have a miniscus corrector in front of the secondary, rather than the drawtube corrector in the VC200l . Apparently they do have quite a flat field. I dont have a vmc so I cannot comment on how flat the field is.
I have used a fli focusers (pdf and df2) and I have found that the robofocus works pretty much as well as the fli focusers with the standard rack and pinion. Saying that the stock r&p focuser must be adjusted correctly.
I agree totally with Doug. The vc200 has a flat field period. The gso rc has curvature, depending on the size of chip you are using, may change your decision.
I did find interesting about Dougs comments is the fact that the vc200 is easier to collimate than the rc. Considering the vc200 is the first scope I have collimated, I really had trouble getting it right. I even cheated and had the secondary centre spotted which makes collimating the secondary with a tak collimation scope a doddle. The rc must be an absolute pain in the rear.
Another factor you may want to consider is image scale. Most dslrs have very small pixels, with the vc with the reducer, at f6, a far better bet to boost your signal/noise and get better images.
I have a highly modified carbon fibre truss VC200 scope. Search under my name to have a look.
Brett
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