Tele Vue 3X Barlow for 1.25" eyepieces | Astronomics.com
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Barlow Lens: Everything You Need To Know - Little Astronomy
Amazon.com : SVBONY Telescope Barlow Lenses, 1.25 Inch Telescope Accessory, Fully Metal Multi Coated Broadband Green Film Barlow Lens 5X for Telescope Astronomy Eyepiece : Electronics
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