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I use the Vixen flip mirror body...
What do you have in mind?
If you can accommodate the backfocus requirements (should be OK with a SCT) you could use Al's Reticule to position the planet etc in the middle of the CCD frame, then obviously flip the mirror before exposure..
In our case (spectroscopy) I replaced the flip mirror with a beamsplitter plate so I can focus and guide on axis.
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