Full Metal Telescope Camera Adapter T-ring + 1.25" Telescope Mount Adapter Simple Barlow Projection - Use with your barlow and camera Eyepiece Projection - Use your eyepiece in extension tube Extended Barlow Projection - Use extension tube with your barlow (Extended barlow projection makes a 2x barlow into a 3x or more barlow) Telescope Mount Adapter: Offers 1.25in mounting size on telescope side M42x0.75mm outer thread on one end and standard 1.25" (31.7mm) fitting on the other Inside of the adapter is fully threaded to minimize reflections Threaded to accept standard 1.25" eyepiece filters T-ring (with M42x0.75mm thread): Connects Nikon DSLR / Canon DSLR camera to the 1.25" Extension tube and Telescope Mount Adapter Extension Tube: M42x0.75mm outer and inner thread One side fits T-ring, the other side fits Telescope Mount Adapter Specifications: Material: Aluminum Color: Black Compatible with: Canon EOS EF mount cameras (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) Nikon F mount DSLR cameras (D4, D4s, D3x, D3s, D3, D810, D800, D750, D700, D610, D600, D300S, D300, D200, D100, D7200, D7100, D7000, D5500, D5300, D5200, D5100, D5000, D3300, D3200, D3100, D3000, D90, D80, D70) Telescopes with standard 1.25 inch eyepiece ports Package includes: 1 x Telescope Mount Adapter 1 x T-Ring 1 x Extension Tube