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It's better to buy another eyepiece than a Barlow. If you have say two eyepieces low power and medium, barlowing the low one won't be much help and bar lowing the medium one will give high power. But to buy a decent Barlow will cost about as much as buying the high power eyepiece you didn't have.
Secondly as a general rule, the fewer pieces of glass in the path, the better, optically - ie a good high power eyepiece will almost certainly be better than a medium one with Barlow.
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