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Hi Mick, I've done the 10" F5 photography thing on an EQ6 with a DIY build Serrurier truss scope. It came in at 11 kg and 17 kg with the rest of the gear attached. I gave up. At that focal length with that weight it is a major to manage especially if this is your first foray into Astrophotography. As others have mentioned you will need more than a little patience and persistence to sort out all the little problems.
I'd suggest an 8" F5 if you are hell bent down that path. Imaging is not all about aperture, the mount and accurate guiding is far more important.
I've built an 8F8 newt for imaging but it's long focal length (and OTA ) makes if a fussy beast to handle so now looking at building an 8F5 or 8F6 as a dedicated astro scope. Big enough aperture but it should weigh in below 10 kg.
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