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If you have tracking, then a 5X would be the best option
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The 5x is only used by guys who do planetary imaging to get large image scale. I don't know
anyone who uses a 5x powermate for visual use - it just gives too much magnification, there's no need for it and the seeing would never support it.
A 2x or 3x barlow is all you'll ever need for visual use, tracking or no tracking.