I currently own an EOS Rebel T3 (NOT T3i) and want to run with an external microphone. The body does not have a jack for an external mic, so I'm not quite sure what to do. Are there any microphones that have a built-in sd slot so it can record its own audio, and then I can sync up audio and video in post-processing? Or do you think I can open up the camera and install my own mic port, overriding the built-in mic? Any suggestions are greatly appreciated!