Ive had absolutely NO problems using a Toucam pro with a 70x500mm guidescope and Guidemaster program with a Shoestring astronomy adapter. If you see a nice star in the guide scope it will guide perfectly on it for as long as you want. If you want to go deeper then use PhD guiding as it stacks the frames to determine the star centroid to guide on - it will also let you use a DSI or DSI Pro.
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