Canon RS-80N3 Remote Switch for EOS-1V/1VHS, EOS-3, EOS-D2000, D30, D60, 1D, 1Ds, EOS-1D Mark II,III, EOS-1Ds Mark II,III, EOS-10D, 20D, 30D,40D, 50D, 5D Prevent camera shake for super telephoto shots, macrophotography, and bulb exposures Works just like a shutter button, enabling halfway or complete pressing Shutter-release lock 2.6-foot (80 centimeter) cable Compatibility-- EOS 10D, EOS 1D Mark II N, EOS 1V, EOS 20D, EOS 20Da, EOS 3, EOS 30D, EOS 40D, EOS 50D, EOS 5D, EOS 7D, EOS D30, EOS D60, EOS-1D, EOS-1D MARK II, EOS-1D Mark III, EOS-1D Mark IV, EOS-1Ds, EOS-1Ds MARK II, EOS-1Ds Mark III