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when adding weight to a fork mounted scope you have to take into account the center of gravity, and balance of the system, Tracking accuracy will be degraded if the balance is not addressed...
The LX200R mount has an autoguide port, and as Theo mentioned, the less individual parts to a setup, the less that can go wrong..
Is the SBIG 402ME self guided? if so, you're on easy street... if not, then the Meade LPI can be used, however you will then need something like the shoestring astronomy GPUSB unit, and run something like PHD Guiding or Guidedog etc...
I would think an off-axis guider would be the easiest option to add autoguiding to the LX200R without throwing out the weight distribution...
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