So you want to mount your Canon Digital SLR on a tripod to get better digital pictures.
Excellent - now you need a way to trip the shutter without moving the camera.
You could use the camera's built-in self-timer, but your subject may be long gone until it trips.
The Canon Remote Switch RS-80N3 may be the answer for you.
The Canon Remote Switch RS-80N3 is a very simple device - it simply plugs into the side of compatible (there are many) Canon Digital SLR cameras.
There is one button on the Canon Remote Switch RS-80N3. It presses in to release the shutter
and slides while pressed in to lock the shutter open (for the B or Bulb setting).

Pictured above is the Canon Remote Switch RS-80N3 beside the larger, more expensive and more capable Canon Timer Remote Controller TC-80N3. Canon Remote Switch RS-80N3 is very light but relatively expensive but valuable to own.
Recommended Shopping Resources
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Canon Remote Switch RS-80N3 at B&H Photo
Canon Remote Switch RS-80N3 at Amazon.com
Canon Remote Switch RS-80N3 at Adorama
Canon Remote Switch RS-80N3 at 17th Street Photo
Find the best price on the Canon Remote Switch RS-80N3
Rent the Canon Remote Switch RS-80N3
(Using these links supports this site)
Canon Remote Switch RS-80N3 at LensRentals.com
* If out of stock, ask the rental company if they can accommodate your need.