Amazon.com : Celestron 93230 8 to 24mm 1.25 Zoom Eyepiece & Omni 2X Barlow Lens : Electronics
Celestron Barlow Adapter Lens 2x 1.25 inch 1-1/4” Model #93507 & Model #93372 | eBay
Amazon.com : Barlow Lens 2X, Bysameyee 1.25 Inch Fully Multi-Coated Metal Barlow Lens with M42 Thread Camera Connect Interface for Telescope Eyepiece : Electronics