I have one last question! When I get everything cocked, my camera's auxiliary shutter only seems to stay open as long as my finger is pressing the button down. Won't that cause problems if there is a slow shutter speed? I turned the little thing on the shutter button to 'T', but then it opened and didn't close. What's the proper way to do this? Or do I just hold the shutter open as long as I need to? Thanks!