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Hi Ric,
Yes, the barlow just drops in to your eyepiece holder, then eyepiece or LPI. Takes a few turns of your focuser to get it back in focus. I strongly recommend though that you find your planet visually first, centre it as best you can. Then insert your LPI, focus and centre. Then put the barlow in, and refocus. Otherwise you can go insane trying to find it!
I think the Vixen barlow is closer to 2X, and the Meade #140 is a bit more. I tried this with the Meade 2X Telextender some time ago, and the result was pretty similar i.e the #140 image was larger than the Telextender.
If my math is correct, the final shot with the 3X Telextender is a ridiculous 1250X magnification!
Clear skies,
Shane
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