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Before you spend any money on an expensive 4x Barlow/PowerMate, I would try the 3x with the extender and see what magnification you end up with. I suspect you should be able to get pretty close to 4x with what you currently have. Have you measured the magnification of your 2x2x barlow combination? I suspect it will be far greater than 4x. Having too high a magnification will reduce the brightness of the planet, and reduce the signal to noise ratio.
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