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is it 900mm focal length?
i think a 5mm for planets & maybe a 8mm for DSo's (i prefer slightly higher magficicaion)
BST explorer (avail telescopesandastronomy SA)or astrotech paradigms are a good starter ep, about 60deg fov with decent eye relief, they make a 25mm also for wide field viewing. they cost <$100 each but offer good views
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