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Yes the guidescope has the webcam at the rear instead of an eyepiceand diagonal, the images it takes are fed into the computer and a program such as PHD which calculates a stars centroid and makes tiny adjustments to your drive to keep the star centered.
Most people use a separate scope for guiding, although I have heard a finderscope being used before.... Somewhere...... The problem would be focusing and ataching it.
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