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Even with a SCT the Nexstar SE mounts shake when focusing, but you quickly develop a light touch to avoid most of that. The lightness of the scope/mount/tripod accounts for most of the shake; counter-intuitively the SE mount is more stable with an 8" sct than with a 6" due to the extra weight. Hanging the jump-start battery pack from the tripod would probably improve things significantly, though the shakes are only when focusing and settle quickly.
Providing you observe seated, the only real problem I see with a refractor is with clearing the base.
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