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hi.. a 10mm and 26mm at 5x is 2mm and 5mm .. the former is basically unusable and the latter only on those good nights. on the other hand the 2x barlow gives you 5mm and 13mm which overall gives you a nice range of magnifications 5mm, 10mm, 13mm, 26mm.
sorry just noticed you are looking at 2.5x not 2x
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