The camera type that I have is the Canon Rebel Xsi, and I was wondering if it is possible to take an automated series of variable exposure shots. For example, hold the shutter button down once, and take a series of three or so pictures, each with a different exposure of -2, 0 and +2. To clarify, this is for the purpose of HDR photography.
If this isn't possible with this camera type, are there any brands/models that can do this?