Astro Essentials 1.25" 2x Barlow with T thread | First Light Optics
SkyWatcher 2x De-Luxe Achromatic Barlow Lens with T-Adapter
Astro Blog Delta « Barlow shootout: Skywatcher, Celestron, High Point, TeleVue Powermate and more «
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