Lets say you have 2 camers.
The movie is 100 Frame long
Camera 1 is looking at an Apple and Camera 2 is looking at a Lemon.
Is there a way to make the movie so the image from camera 1 lasts until the 50th frame and then it switches to Camera 2 for the final 50 frames?
There is a script that alows you to do that. there is a video tutorial also called
Video Tutorial: How to Change Cameras during an Animation in Blender