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The 120mm works great for guidescope guiding in my experience. I did buy a ZWO OAG a while ago to use with my C9.25. I used it once and could find guide stars but my HEQ5 pro mount didn’t seem to be able to keep up with that sort of resolution. Since then I have tuned my mount to within an inch of its life but I haven’t tried it again so I can’t honestly give you a fair evaluation of its use in an OAG.
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