Description: brand new and high quality Features: It offers 1.25 inch mounting sizes on telescope side. The .M42x0.75mm has an external thread on one end and a standard 1.25" (31.7mm) accessory on the other end. The inside of the adapter is fully threaded to minimize reflections. The thread accepts a standard 1.25" eyepiece filter. Main for focus photography - use the camera directly. Simple Barlow Projection - Use your Barlow and camera above. Eyepiece projection - Use the eyepiece in the extension tube. Extended Barlow Projection - Use the extension tube with Barlow (expanding the Barlow projection to make 2 times the Baal to 3 times or more Barlow). Compatible: - for Nikon F-bracket SLR camera (D4 D4s D3x D3s D3 D810 D800 D750 D700 D610 D600 D300S D300 D200 D100 D7200 D7100 D7000 D5300 D5300 D5200 D5100 D5000 D3300 D3200 D3100 D3000 D90 D80 D70 ......). - A telescope with a standard 1.25-inch eyepiece port. Specifications Product name: Telescope Extension Tube Color: black Material: aluminum Size: as the picture shows Sleeve interface: 1.25 inches (about 31.7mm) Thread size: M42*0.75mm Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Include:(other accessories demo in the picture is not included.) 1 x Telescope Mount Adapter 1 x T-Ring for Nikon 1 x Extension Tube