Hi Geoff,
Thanks.
No, the barrel of the powermate unscrews and then the lens element screws into the Powermate adaptor which in turn screws into the screw thread of the T ring.
As a back up plan, I wrap my canon strap around the base of my finderscope bracket so it catches it if I loosen the focuser screws and the camera decides to slip out. Hasnt happened yet, but I always do it, just in case.
Make sure you try Backyard EOS too, if your camera doesnt have movie mode, this simulates it by capturing the live view from the camera, PLUS gives you the 5x planetary mode....its great.
Cheers
Chris
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