Has anyone used a wired cable release with the XT2? If so, what brand? I have a "Vello ShutterBoss" that I thought was compatible, but I can't use it on Manual and hold in the button for as long as I want. It will do a 30 second shot and bracket shots (if I use the Timer Start/Stop button) instead of the button that one usually uses to take the shot. I used the Vello on my Canon Cameras in the past. I am getting ready for a big trip and would love to get this figured out soon. I don't know if it is a setting, or just not compatible. Thanks for any input.