Gosky 1.25" Telescope2x Barlow Kit and Telescope Camera Adapter Kit for Sony NEX Camera This is a very useful accessory kit for prime focus photography. A Coated Barlow/T-adapter and a T-Ring for Nikon Camera Attachment is included in the package, both of which also can be used separately. There may be a problem with some T-adapters that you need to buy an extra barlow lens to get infinity focus. Use the barlow/T-adapter in three ways. 1. A 2x barlow; 2. a universal 1.25-inch Camera T-Adapter; 3. 1.25-Inch Telescope Eyepiece Extension Tube. Works on Celestron, Orion , Sky-Watcher , Meade and most brands of telescope. The barlow is made from quality coated optics and metal body. And the T-ring for Nikon is precisely CNC-machined. Includes both end caps to protect against dust.