Photographic calculator. Shallow Focus calculates the DOF (Depth of field) and the FOV (Field of view) of an image. Previsualize DOF and FOV on a virtual scene. Analyze the DOF of an existing photo. Shallow Focus also calculates the proper exposure parameters for a given amount of light in a scene. On Windows 8 devices equipped with a light sensor, this will make your Windows 8 device a photographic light meter.