Changes the focal length on a camera. Zooming in is like using a telephoto lens. Zooming out is like using a wider angle lens. You can use zoom in both a perspective or orthographic view.
To open the Zoom Tool options
To move in or out without changing the viewing angle, use Dolly.
Scales the speed of the camera movement. The slider range is 0.01 to 3. The default value is 1.