Hi all, I bought two sets of Knight Flashgun ETTL trigger (TR-332) that comes with Receivers and Transmitters not too long ago, tried on 50D with all the correct setting with no problem, but when I tried on my 1D MIV with the same setting, it failed to trigger the flashguns (Canon 580EXI & II), I am kind of puzzle & lost, can everyone help & advise me on this? Thank you.