This video tutorial will show you how to use multiple cameras in your animation, and easily control the camera switching in your animated scene.
To assign a camera to be active at multiple points during your animation, simply add the necessary frame numbers to the camera's name, separated by commas (no space required).
A camera desired to be the active camera at frames 48 and 1726 should be named as follows:
You can have as many assignments per camera as desired, up to the character limit for object names. Note that frame numbers greater than 4 digits should not be formatted with commas (i.e. 1,429 should be named as 1429).