... flash E-TTL Off-Camera Shoe Cord for c anon DSLR and Flashes replace OC-E3b It can be used as ... -anon Speedlites when used off-camera with C-anon SLR/DSLR cameras, all automatic functions of the EOS cameras are retained ... Canon ex/ez series speedlites and EOS cameras, for Canon DSLR EOS 1Ds, EOS 1Ds Mark II III, 10D, 20D, 30D ...