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The lowest magnification at which you can easily make out the Airy disk image of a star on a night of better-than-average seeing is the highest magnification that might will reveal new detail on any object. For the ED80 that is around 130-160x. But it is a fantastic little scope and I have taken it to 240x without any problems. At 240x I got a bigger (and dimmer) image but no more detail than at 150x.
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