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Hi Rob,
If you want a coma corrector for visual use only I would forget about the Baader MPC. It's an absolute pain in the niagras to adjust it every time you change eyepieces. The Televue tunable top paracorr is the only way to go for visual astronomy, notwithstanding its significantly higher cost and the fact that it increases the eyepiece focal length by an effective 15%. If you want it for imaging then that is a different matter. The Baader MPC was designed as a photographic tool, the Televue Paracorr as a visual astronomy tool. That all having been said, I think its a marginal thing and subjective to personal preference, with any telescope of F5 or slower.
Cheers,
John B
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