Apple Motion 4 - Manual (Page 1214)

Using Cameras to Set Up Useful Working Views
When building a 3D project, it can be useful to position cameras to examine your project’s
layout from different viewpoints. Rather than repeatedly moving the Perspective camera,
you can add scene cameras to use as “spatial bookmarks.” You won’t want to use these
cameras during export, so be sure to disable them before rendering.
Depth of Field
In the real world, cameras have a limited range of focus. Objects within that range appear
sharp, and the further outside that range an object is, the blurrier it appears. This effect
is used by camera operators to help limit which part of a scene the viewer pays attention
to. Motion allows you to simulate that phenomenon, thereby increasing the sense of
depth in a 3D scene.
Every camera in Motion has a focus offset that determines the precise location of perfect
focus. Stretching away from that point in either direction are near and far focus points,
which determine the range of the depth of field.
Depth Of Field Focus Offset
1214 Chapter 18 3D Compositing