Since I learned about HDR recently, I have been using the bracketing option with my T4i to take 3 shots and then use Photoshop to merge the exposures. I have been very pleased with the results, but am having a problem getting the camera to take all three exposures automatically. It seems that when I set the camera for single shot I have to manually click the shutter for each exposure, but when I set the camera on a 2 sec delay it takes all three exposures in succession. Is there some reason the camera won't take all three exposures automatically in the normal shooting mode?
That's normal. But you can turn on CONTINUOUS DRIVE MODE to take 3 shots if you press and keep the shutter button. For SINGLE SHOOTING mode, it is expected to only take 1 shot, thus the name.
For timer mode, of course, you don't want to press and wait 2-s for every frame.