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Purely on a factual basis, 1000 divided by 6 ie. the shortest eyepiece, is only 160x so where the 750x comes from would appear to be from a fertile imagination. The eyepieces are labelled K which, I assume, means they are Kellners, which are VERY basic in design, just an achromatic step up from the original Ramsden design.
Disclaimer: An astronomical newbie but a lifetime in optics!
Cheers
Graeme
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