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Even if the performance of the zoom is not quite up to that of good quality discrete eyepieces, the convenience and versatility of the zoom make it worth owning one imho. It could be used to find the highest magnification on a given night or the best exit pupil for a DSO before switching to the appropriate fixed focal length eyepiece, or you might want to carry a portable scope out for quick looks without taking a box full of eyepieces.
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