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Rally,
Back, as you say to the original question....
I'm glad to see that seeing conditions are mentioned.
I semi-regularly (weather limited) use the C11 on the NEQ6pro at f10 (2800mm fl) with a reflective slit plate guiding (similar to an on axis OAG) and Lodestar.
My target is to keep the FWHM star image central on a 20 micron slit for at least subs of 10 mins. At "good" seeing of 2 arc sec the FWHM is 27 micron.
Using PHD2 (or the AA6 guiding) this seems doable.
Just my 2c
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