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I’ve never owned or used an AZ EQ6GT but I own 2 off EQ6-R mounts ( one in Sydney under Bortle 8 skies and one on the South Coast NSW Bortle 3 skies , this ones going into my NexDome within 2 weeks ) and can certainly recommend these mounts for payloads up to 15kg and excellent performance with tracking and guiding. Dec backlash is minimal out of the box and they are easy to tune if you wish.
EQ6-R mount in Sydney has a 9kg payload ( 6” f6 newt )
EQ6-R mount down south has a 15kg payload (8” f5 newt )
I’ve seen folk sticking 10” f4 and 10” f5 newts on these things in an Obs with no issue
Guiding numbers vary as we all know due to conditions etc....but I’ve had these mounts down to Dec 0.62 and Ra 0.72 with piggyback guide scopes and 1000mm focal length. With lighter payloads, fine tuning balancing and mounts Dec and Ra drive and worms , using an OAG there’s no reason why you could get tighter guiding numbers
My EQ6-R in Sydney is a early 2019 model with the additional USB port and the EQ6-R down the coast is a late 2018 model without USB port ( just standard RJ45 handcontroller port )
I control both mounts with EQMOD and the new Ascom Stellarium
NB: In nearly 4 years of imaging I’ve never had to release the clutches on my mounts during imaging nor have they slipped so never even thought of or considered needing encoders for alignment re acquisition at anytime
Hope others can chime in and provide their own advice and experiences on either mounts
Good luck with it
Cheers
Martin
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