Hi Lee. HEQ5 is a quite capable mount, at some point mine carried 102 mm ED doublet and 80mm triplet on top with a camera and motorised filter wheel (see the photo) and I was successfully imaging at about 1.5 arcseconds per pixel.
Nevertheless, it was the mount's upper limit, and for this very reason I upgraded to AZ-EQ6; the new mount has significantly smoother PE curve, but is also noticeably heavier.
If you are going to use the mount predominantly for imaging, I would recommend the bigger brother of the two.
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