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Amazon.com : Telescope Barlow Lenses Kit 2X-3X-5X, 1.25 Inch Telescope Accessory, Fully Metal Multi Coated Broadband Green Film Barlow Lens for Telescope Astronomy Eyepiece : Electronics
Amazon.com : Barlow Lens 3X, 1.25 Inch Fully Multi-Coated Astronomy Barlow Lens for Standard Astronomical Telescope Eyepiece : Electronics