Hi Wade - forgot about load capacity: the HEQ5 is rated to carry 15 Kgm - don't know the specs of your Celestron but would assume it's well within the HEQ5's capacity.
The EQ6 is the biggest of these mounts in terms of carrying capacity, but they certainly start to weigh a fair bit on themselves, for portability requirements. Again unsure of actual weights but would imagine the HEQ5 could handle most probably all 8" scopes with ease.
I only use my HEQ5 with a f8 6" achro refractor: this is why I've made a custom pier that has the mount/leveller plate set at 1350mm above ground to give me good ergonomics. (Looking at objects near the zenith with these on the tripod set-up has your chin on the ground almost!)
The achro plus baggage is about 10 plus kilos, which the HEQ5 does with consumate ease. One of my initial imaging forays is to piggy-back a camera to take wide-angle sky shots using my mount.
I've just purchased a webcam that's modified for use as an auto-guider: my imaging knowledge is non-existant - but I'm sure you'll pick up plenty of sound advice for your requirements on IIS. (put it this way, this is what I'm trying to do myself!!!)
Cheers, Darryl.
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