Please follow these steps to set keys on the Lens track. You may also refer to the Lens of the Camera section for more information.
Select one camera from the Camera and Shader Floating Menu drop-down list. Go to the desired frame you want to set the lens key.
In the Modify page, scroll to the Camera section.
Choose one of the template buttons for lens focal length or drag the slider to define custom focal length. A new key then will be added into the Lens track automatically.
Go to another frame and change the lens value.
The transition effect between two keys generates by iClone.
The transition effect looks like the following illustrations. The camera looks like it is moving but it is actually the result of changing the lens focal length.