Description: Brand new and high quality Features: Offers 1.25-inch mounting sizes on the telescope side. M42x0.75mm features an external thread on one end and a standard 1.25" (31.7mm) accessory on the other. The inside of the adapter is fully threaded to minimize reflections. The thread accepts a standard 1.25" eyepiece filter. Primarily for prime focus photography - use your 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 a Barlow (extend the Barlow projection to make a 2x Barlow into a 3x or greater 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. Specifications Product Name: Telescope Extension Tube Color: Black Material: Aluminum Size: As the picture shows Sleeve Interface: 1.25 inches (approximately 31.7 mm) 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 includes: (other accessories demo in the picture is not included.) 1 x Telescope Mount Adapter 1 x T-Ring 1 x Extension Tube