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 EF Mount Camera (5D, 5D Mark II, 5D Mark III, 20D, 30D, 40D, 50D, 60D, 100D, 350D, 400D, 450D, 500D, 550D, 600D, 650D, 700D, 750D, 760D, 1100D, 1200D, 1D, 1D MkIII, Digital Rebel T4i, T3i, T2i, T1i, Xt, Xti, XSi, XS ......). A Telescope with a standard 1.25-inch eyepiece port. - 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 1 x Extension Tube