Hot answers tagged bulb-mode
You can use a wired remote release that has a built in intervalometer, such as this fairly inexpensive one or this one. Regardless of the brand name stamped on them, they all seem to be made identically. You then set the camera to Bulb and let the timer in the remote open and close the shutter.
Get Magic Lantern. Opens up a whole load of neat stuff including an intervalometer. And it's free!
Generally you should use a remote shutter release to hold the shutter open for a prolonged period. This also prevents camera-shake that is usually associated with touching the camera while taking a long exposure. Several options are available from simple lockable switches to complex intervalometers. Each have their own advantages but to get started a cheap ...
Taking a look at page 78 of the manual as far as I can tell your camera does not have any option to extend beyond 8 seconds in camera. I also don't see an option for a remote control or shutter release that would give that ability. You could(and should) stack multiple 8 second exposures in post processing though. Take a look at this existing question: How ...
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