Marc hit the nail on the head here... I've used OAG's, similar focal length scopes, fairly varied focal lengths (C11 @ 2800mm with a 400mm F/L guider) and even as Marc said, a finder scope..
All of these things worked just as well as the next, however I've had best results from an OAG or self guided cameras. These really are the best way to remove differential flexture from the equation entirely.. The downside is you can't really use an OAG in with a DSLR lens... However I'd use a finderscope for DSLR lens imaging..
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