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Your Tasco would be fine for auto guiding Carl. If you are manually guiding then your guidescope should ideally be at least 1.5 times the focal length of your imaging scope. If you were to get a 2.5 or 3x barlow (you will need a .925" to 1.25" adapter I suppose.) and a .63 FR for your SCT, you would be fine manually guide with an illuminated reticle. I imagine you will be pushing the weight limit of your mount though.
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