Camera.fieldOfView

var fieldOfView : float

Description

The field of view of the camera in degrees.

This is the vertical field of view; horizontal FOV varies depending on the viewport's aspect ratio. Field of view is ignored when camera is orthographic (see orthographic). See Also: camera component.

JavaScript
    // Set the camera's FOV attached to the same game object to 60
camera.fieldOfView = 60;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Example() {
camera.fieldOfView = 60;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Example():
camera.fieldOfView = 60

Another example using specifically the main camera:
JavaScript
    // Set the main camera's field of view to 80
Camera.main.fieldOfView = 80;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Example() {
Camera.main.fieldOfView = 80;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Example():
Camera.main.fieldOfView = 80