2inch UltraWide Telescope Camera Adapter for Canon EOS & Rebel SLR/DSLR -Ultra Wide Up to 10mm Large Clear Aperture - with 2&rdquo; Filter Threads Specially designed for 2 prime focus, the adapter features large 45mm through hole and takes you directly from the cameras bayonet mount to a 2" Barrel with as few wasted photons, thus getting as much as 10mm more clear aperture. Fits all Canon EOS cameras: 1D, 5D, 10D, 20D, 20Da, 30D, 40D, 50D, D30, D50, D60, 300D, 350D, 400D, 450D, 500D, 1000D, Rebel, Rebel XT, Rebel XTi, Rebel XS, Rebel XSi, Rebel T1, Rebel T1i. Standard 2" barrel size to insert to 2" telescope focuser or other accessories. Threaded for Standard 2" Eyepiece Filters (48mm) (thread inside tube). Baffles is machine-threaded and anti-reflection painting process to reduce internal reflections. All metal construction. Anodizing Aluminium process.