EOS 1Ds, 1Ds Mark II, 1Ds Mark III. EOS 1D, 1D Mark II, 1D Mark II N, 1D Mark III, 1D Mark IV. EOS 1D X, 1D X Mark II, 1D X Mark III. This SR-2 remote switch is fully compatible with Canon RS-80N3. The remote switch works just like a shutter button, enabling halfway or complete pressing.
eBay