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Yes the 2x will double "the power" but it will also cut a sizable chunk of light that reaches your eye. Barlows magnify but they also make object appear dimmer. Unless you live on a high mountain in Chile you will never use 660x as the atmospheric conditions will not allow it so forget the 3x. Don't be fooled by the power game unless you enjoy viewing unresolved blobs at the eyepiece. I would suggest that you save and buy some good quality eyepieces that are suitable for your focal length as these would be a far better investment.
Mark
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