Apertura 1.25” Barlow Lens | 2X Magnification |High Point Scientific
APM Telescopes. TS OpticsTSB21T2 2x Barlow 1.25" with integrated T-thread and Photo Adapter
Amazon.com : SVBONY 2X Barlow Lens 1.25 inch Double The Magnification Multi Coated Broadband Green Film Telescope Accessory with M42 Thread : Electronics