Depth of Field (DOF) is a photographic technique used to convey scale (size) and areas of interest in a composition. Clever usage can lead a viewer to certain parts of your image and increase photorealism by correctly mimicking a real-world lens. RenderMan provides controls for realistic and compelling images with depth of field.
The idea is for the camera to mimic the eye's ability to focus at only a certain distance (i.e., you can't see far away clearly if you're looking at something close, and vice versa). Depth of field can improve your 3D renderings in several ways. First, it can make your images more realistic by emulating how human eyes and cameras perceive the world. For example, you can use In this short 'how to' tutorial, in only three simple steps you'll learn how to create DOF (Depth of Field) using Arnold renderer in Maya. Hope you find this 5KgRp.