iFixit

At this point, the rear facing camera can be disconnected from the logic board.

Unlike the iPhone 4, the fourth generation Touch's rear-facing camera does not support autofocus and is a much lower resolution.

For those of you who are wondering, there's no way the iPhone 4's rear camera can be installed in the Touch without some extreme hackery.

This camera is 6.5 mm square by 3.3 mm tall. That is dramatically smaller than the iPhone 4's rear camera.

Just above the rear camera, the cylindrical silver object is the microphone, a new feature for the iPod Touch line.