["Description:\r\nbrand new and high quality\r\nFeatures:\r\nIt offers 1.25 inch mounting sizes on telescope side.\r\nThe .M42x0.75mm has an external thread on one end and a standard 1.25\" (31.7mm) accessory on the other end.\r\nThe inside of the adapter is fully threaded to minimize reflections.\r\nThe thread accepts a standard 1.25\" eyepiece filter.\r\n\r\nMain for focus photography - use the camera directly.\r\nSimple Barlow Projection - Use your Barlow and camera above.\r\nEyepiece projection - Use the eyepiece in the extension tube.\r\nExtended Barlow Projection - Use the extension tube with Barlow (expanding the Barlow projection to make 2 times the Baal to 3 times or more Barlow).\r\n\r\nCompatible:\r\n- for 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 ......).\r\n- A telescope with a standard 1.25-inch eyepiece port.\r\nSpecifications\r\nProduct name: Telescope Extension Tube\r\nColor: black\r\nMaterial: aluminum\r\nSize: as the picture shows\r\nSleeve interface: 1.25 inches (about 31.7mm)\r\nThread size: M42*0.75mm\r\n\r\nNote:\r\nTransition: 1cm=10mm=0.39inch\r\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\r\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage Include:(other accessories demo in the picture is not included.)\r\n1 x Telescope Mount Adapter\r\n1 x T-Ring for \r\n1 x Extension Tube"]