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Hi Graeme,
I tried imaging behind a 2X Barlow once and wasn't very impressed, the chromatic aberration was disgusting. I suppose it depends on the quality of the Barlow, mine was cheap. I think the Powermates have better quality glass in them and may better for imaging.
Is your concern the extra weight on the focuser causing flexure? This could be remedied by supporting the camera with springs from the camera to the UTA.
Cheers
Bill
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