All of the tutorials I’ve seen about multiple cameras require the use of multiple scenes or compositing images rendered from various cameras.
I’ve found a slightly easier method to simulate multiple cameras. It only uses one, but it’s still easier than compositing or rendering multiple scenes:
Place empties at all camera locations.
In the frame before the camera switch insert a loc key
In the frame of the camera switch move the camera to one of the empties. Rotate as necessary unless tracking is enabled.
Insert another loc key
In the IPO window select all, press “T” and select Constant.
I use cameras instead of empties so you can just position them normally, and copy location and copy rotation constraints instead of locrot keys, but yeah.
The constant IPO is very important if you’re using motion blur because if the camera moves over the course of a frame instead of instantly, the frame of the camera switch will be blurred. I usually don’t use this technique because I didn’t think of that, maybe I will use it more now.