Remote Shutter Release RS-80N3 For Canon 1Ds Mark II, 1Ds Mark III
Canon EOS 1Ds, 1Ds Mark II, 1Ds Mark III. Canon EOS 1D Mark II, 1D Mark II N, 1 D Mark III, 1D Mark IV. And, a shutter release button lock is available which for long exposures shooting and Continuous shooting helpfully.