Hi Molly, a 'safe' to assume max mag for your scope would be 200x, in good 'seeing' etc.. and your EP's would not reach that eg, the 10mm would give 90x ( assuming the 900Fl version, or 65x for the 650 Fl version of the 130mm reflectors)
...a barlow of 2x would be quite reasonable at that rate.. but it might depend a bit on how good the EP's that came with the scope are.
perhaps you might borrow one from a kindly soul to see for yourself if you think it's worth the investment?
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