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The Bintel ED is the same as GSO ED 2x barlow. 2" right? Its excellent. Optically excellent and does not introduce extra light scatter as far as I can tell. You can even unscrew the lens housing and thread it onto the end of a 2" eyepiece like a light filter for variable magnification. I think its about 1.6x in that configuration. Also, when the lens are removed you can use the body of the barlow as an extension tube for when you need more back-focus than what your focuser would normally allow.
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