Depthof field can be easily toggled on and off from the Corona Camera’s UI, and the focus can be set by picking any object in the scene using the Override focus > Object option. The selected object’s pivot will be used to determine the position of the focus point. This is especially useful if the focus should be locked on a moving object during animation.
Motion Blur
Camera–Enables the motion blur due to camera movements. For a complete motion blur solution, you need to enable geometry motion blur as well.
Geometry– Enables motion blur due to the movement of scene geometry. For a complete motion blur solution, you need to enable camera motion blur as well.
Shutter Curve –Allows to control Motion Blur by using a shutter curve.
Overridefocus– By default, the camera always focuses on its target distance. This override lets you specify another focusing method - either a distance separate from the target distance or focusing on another object pivot.
Value – Defines the focus target distance.
Object– Helper node, position of which specifies the focal plane of the camera. Useful to keep the camera focused on the given object.