Hello,
Not to steer you away from the suggestions here re: az/eq6 over a 5. They say you buy less mounts than you do telescopes. Oh and I also have no idea about Ap... but.
If you look at the "sky and scopes" article for the mounts used for "Astronomy Photographer of the Year" competition for the past two years (2019 & 2020). Of the 252 shortlisted images, 124 listed mounts used, the SW az/eq pro R was a clear favourite, as were SW mounts in general (39%) - the HEQ5 pro was third. (But pricing has its hands in there somewhere)
So, that would compound what has been suggested.
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My question is - Are you looking at a mount that will take you through a lot of scopes? or a mount to suit the red cat?
With the Red Cat you have a really nice light weight scope (1.8kg?), with lenses/finders/camera's your not going past 5/6kilo in a hurry. Starting from around $1k for a used iOptron to $4-5k for a high end Hobym 140 new - maybe team up a good light weight scope with a good light weight mount.
Others might suggest better portable mounts if you decide its a good match.
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With a light weight mount you have a perfect grab and go/travel package, but not the future expansion that the AZ/EQ6 R offers.
Steve
"Sky and scopes" article for the mounts used for "Astronomy Photographer of the Year"
https://skiesandscopes.com/astrophotography-mount/