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I use the NEQ6pro/ CdC/ PHD2 combo with a C11 (at f10) for spectroscopy.
PHD usually reports 0.2 pixel RMS guiding - this certainly maintains the target star on my 29 micron slit gap...
Using the lodestar guide camera (2 x 2, = 16micron pixel) this equates to RMS around 3.2 micron.....
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