EYSDON 5X Barlow Lens 1.25" Metal Fully Coated Focal Length Extender With M42 Camera T2 T Ring Adapter For Telescope Photography|Monocular/Binoculars| - AliExpress
Amazon.com : Bresser Barlow Telescope Lens 5X 31.7 mm / 1.25 Inch 3-Element Design and Multi-Coated : Electronics
Amazon.com : Barlow Lens 5X, Multi-Coated 1.25" 5X Barlow Lens M42 Thread for Telescopes Eyepiece M42 x 0.75mm Thread T-Adaptor, Can be Attached to DSLR or SLR Camera via a Separate Ring