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The only thing I'd worry about is the size & weight of the guide scope, being a 4.5" newtonian instead of a smaller/lighter refractor of the same focal length. I decided not to use my old 4.5" newtonian as a guidescope on my 12" LX because of it's length & weight. But if your equatorial mount can handle the balance & weight, then I would've thought the focal length will be nice, probably with a barlow involved, maybe not.
Roger.
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