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If you have a sensitive guide camera, like an STi or Lodestar, then my advice is to go with the OAG.
With a sensitive camera finding a guidestar isn't an issue, and an OAG gets around all the hassle with misalignment and flex between the guidescope and main scope.
It also means less weight on the mount and less complexity all round really.
I only use a guidescope for hyperstar work, otherwise I always us an OAG.
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