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Actually for planetary work there is little difference excepting one. With the 2x you can move the camera away from the elements of the barlow and the magnification will continue to increase. However, with the 2.5x powermate if you move the camera further away (via an extension tube) the image will get smaller. I have used both extensively and don't prefer one over the other. I probably use the 2x more than the 2.5x
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