Remote Shutter Release Cable RS-80N3 for Canon EOS EF RF Compatible Bulb Lock .
Really good quality substitute for Canon's RS-80N3 shutter release cable. It also has a lock facility for use with "Bulb" mode. EOS 1D MkII. EOS 1D MkII N. EOS 1D MkIII. EOS 1D MkIV. EOS 1Ds MkII. EOS 1Ds MkIII.