I actually have one of the Baader ones on the way (Hopefully receive it today) with potential to modify it if required to reduce back focus usage. I can't open the second link but the issue I see in most of the slimmest ones is the likelihood of introducing tilt when rotating. Have to see how I go with the one I have coming, if it works I just have to buy a second example of one or the other part of it to be able to use it as a quick changer to have easy movement of the camera between scopes as well as rotation.
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