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Renato has got it right. If you want to, get an extender, dont start modifying your tube length. The GSO 30mm superview is a good eyepiece. It has a 70 degree afov. With a GSO 2inch barlow you can use it in the 2x mode, and by screwing the barlow lens into the eyepiece, it works as a 1.5x power booster.
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