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John,
I usually use a Lodestar on my slit guiding (similar to an on axis guider ;-) ) with the C11 at f10.
For mag 9 stars I usually use around 1.5sec guiding exposures with PHD2 (or AstroArtV5), no issues...
I'm trialling the QHY5II L(mono) and find the same....
Hope this helps.
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