i have tried the Manfrotto 322RS shutter release on my camera, one of my dealers brand new 70d, a few Rebels and 1/2 dozen 2.5" stereo cables and ALL exhibited the same issue with not only the Manfrotto 322RS but with several cheap knock off wired remote shutter releases. The only way to get any of the cameras to fire was to pull 2.5" plug about 1/8" to 1/4" out of the the camera bodies and then they work. Manfrotto says correct cable is 522SCA which Is basically just a 2.5" stereo cable and Canon says any 2.5" stereo cable will work except they don't? This is now been verified using my two Canon camera bodies and 2 cables and the stores 1/2 dozen cables and 3 more bodies as well as 2 different triggers similar to the Manfrotto 322RS. So my question is what gives? The only wired remotes that seem to work are the kind that have a control box on one end and 2.5" stereo connector going to camera body. So what gives? The only wired remote I can use is canons and seemingly a 2.5" cable will not trigger My 70d or Xsi.
