ZWO makes a nice ring to support the cooled cameras, but the uncooled cameras have a threaded 1/4-20 hole on the back and a smaller body diameter so the ZWO ring won't hold it. There are a number of solid low-profile camera mounts available for dovetails but they all assume the 1/4-20 hole is on the bottom of the camera, not the back. At the moment I'm using a larger camera mount I had sitting around that can bend at 90 degrees but it seems less than ideal in terms of both size and solidity.
The obvious solution would be a nice heavy aluminium right angle bracket with a couple of holes, one for camera and one for dovetail, but nothing like that seems to exist. I'm probably going to end up with a pair of 90mm rings - overkill for the 55mm lens but probably required for the 200mm lens - but it seems surprising to me that nobody offers right angle brackets for dovetail mounting. Any ideas ?