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The suggested maximum magnification for a scope (any scope, not just a low-end model) is rarely achievable due to seeing conditions, and you'll find views tend to become grainy/blurry as your magnification gets higher. A 5mm eyepiece will give you 140x magnification which is pretty much near the limit for this scope and unlikely to give optimum views unless seeing conditions are excellent. I don't know that these scopes are designed to be used at such high powers, (although the marketing material will try to tell you otherwise) and we've certainly had better views using it for lower mag wide field viewing. A 5mm EP in any sized scope is probably going to give you magnification that atmospheric conditions will only occasionally allow you to use - I have 8" and 16" dobs and rarely use a 5mm EP. Enjoy your scope for what it is, and remember Christmas is just around the corner if you want a bigger scope!
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