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The 2 inch Barlow mentioned will have an adaptor for 1.25 inch eyepieces..or you can put an adaptor on. Thus you can fit 2" & 1.25" eyepieces to the one Barlow...thus "Two for the price of one". No performance loss when using 1.25" eyepieces.
If your planning to buy 2" eyepieces then a 2" barlow is a better option.
2" Barlows cost more though.
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