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I use successfully an "on axis guider" - reflective slit plate for spectroscopy and PHD2 can easily hold a target star on a 19 micron slit gap as long as required. This is a C11 on a NEQ6pro mount.
I find that the mirror slop/ flop on the Celestron much much better than the Meade SCT's I had. The trick is to regularly move the primary mirror through the full focus travel (30 turns or so) to re-spread the grease on the baffle tube.
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