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I guide my spectrograph on the C11 at f10 with a reflective slit plate ( think of it as a on axis OAG).
I've been using the Lodestar for the past eight years (and occasionally a QHY5Lii).
The main spectral imaging camera is the ATiK314L.
Using AstroArt guiding (or PHD2) I can regularly achieve >10 min subs - based on holding the target star on a 20 micron slit gap (!!)
Never had any issues finding and guiding on target stars.....
Just my 2c
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