Hi Andrew,
Didn't mean to lecture you about u on f stops, just my way of comparing things. The salesperson needs to be taken to the accc as it just isn't possible to see the horse head through the 4se
Back to your question about dobs on an AZ mount, are you referring to the Newtonian tube on an AZ mount like your Se mount? Dobsonians by definition is already sitting on an AZ mount, just a manual one.
Some AZ mounts can carry a 8" Newtonian OTA, like the ioptron minitower
https://www.ioptron.com/index.cfm?se...c-1045d25b0651. But it still has limitations of an AZ mount for astrophotograghy work.
Mounts have rated carrying payload capacities, for visual observation, you can push the mpunt to their rated limit, provided you balance the mount. For photo work, you should do about 70-75% of the rated capacity only.
There are lots of big dobsonians with Argo navis, SDM being one of them
http://www.sdmtelescopes.com.au
So yes, it is possible to carry a Newtonian OTA on an AZ mpunt or eq mount, or if you're into visuals, then a true dob with or without goto and the wallet is your limit
Bo