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I'm one of the people here who has the 30mm 80° ep, and I have used it with my GSO 2" barlow and yes I do like it.
Without the barlow this ep suffers from heavy seagulling in the outer field of view, but I like using it as my "big porthole" view ep anyway, or when searching around to cover as much sky as quick as possible.
With the barlow in place the image loses all of that distortion and the view provided is pretty good - not a Nagler class view of course, but not even close to Nagler money either even counting the cost of the ep (according to Andrew's website right now available at $59!!) and the barlow (2" 2x GSO $49).
For someone on a limited budget (like me) who wants a big wide view, and the ability to switch from a 30mm view to a 15mm view I'd definitely recommend it, and that was before I saw the price drop on the ep itself.
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