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Hmmm. I'm not really reference material on visual options for barlows Ben. I have a 1.25" and 2" barlow, both GSO and very happy. The 13mm Nagler + GSO barlow is up there with my 6mm Radian, particularly because of improved FOV and eye relief.
I would suggest spending most you can on eyepieces rather than barlow. Happy to be corrected by the experts though - I'm sure Televue barlows are top quality.
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