RE: Back up Camera
Yes you can use a wireless mic on the GL1, it has a mini jack for external mics, and most wireless mics have both mini jack or XLR jacks to use. The only thing is that you can only use either the external mic or the on camera mic or mic connected through hot shoe. To be able to run multiple mics like a shotgun mic and wireless at the same time, you will need to buy a mixer. The mixer will plug into the mini jack on the camera, and the mics will plug into the mixer and you can adjust the levels there and send it into the camera. Make sense? A decent inexpensive mixer is the Azden Cam 3 mic mixer. Or you can buy a Beachtex XLR adapter/mixer. Also Canon has their own XLR adapter/mixer, although I don't like it that much. If you are going to be running multiple mics, don't buy the Canon DM-50 shotgun mic, it runs off the hot shoe and you won't be able to run wireless in conjunction with it then.