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Brett, I’ve found that trying to secure the camera to the mount/scope using the screw thread on the bottom of the camera to be unreliable.
I tend to use a set of guide scope rings to secure the lens, and then just use the lens mount to hold the camera body. There are usually several positions along a lens that don’t move during focusing or zooming, you just have to identify the spots there.
The advantage IMO to this method is that if you attempt to align with the main scope (aka guide scope!) then it’s easier to adjust the pointing of the camera+lens this way.
I’ve not attempted mosaics in anything more than a crude way, so can’t really suggest anything useful there.
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