Barlow Lens: Everything You Need To Know - Little Astronomy
Datyson 1.25" 2x Barlow Lens Fully Multi Coated Metal with M42x0.75 Thread Camera Connect Interface for Telescope Eyepieces|lens 2x|lens for cameralens for telescope - AliExpress
Amazon.com : SVBONY 2X Barlow Lens 1.25 inch Double The Magnification Multi Coated Broadband Green Film Telescope Accessory with M42 Thread : Electronics
Help with telescope. 10” Skywatcher Dobsonian. Using a 2x Barlow lens with either a 10mm or 25mm. I've even tried using the extender. My results are why you see in the pic,