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Joel,
A 2.5x Barlow will give you an eyepiece equivalent of about 5mm, and as you say, a mag of 230x. You won't get many nights a year that you will be pleased with views with that sort of magnification. You'd be better off going with a 2x Barlow (185x). Better yet, a 7mm eyepiece, or even better, and VERY useable in that scope, a 9mm eyepiece.
Cheers,
Jason.
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