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Simply from the fact that by adding the barlow you are doubling your exposure time and the potential is there then for tracking errors, I would say yes have an auto guider. Besides the GM8 doesn't have quite the same PE accuracy as the G11.
Guidescope? Anything in the 60 - 80 mm, 400 - 600 mm range would be fine. Even an old DS wobbletronic as long as it had the 1.25" eyepiece holder.
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