Set Field of View Numerically

To set the Field of View numerically:

Double-click either the Trackball or one of the Camera controls. The Camera & 2D Projection dialog appears.
With the Camera View active, make sure the General tab is visible.
Enter a value in the Field of View field (FOV). The value in this field, expressed in degrees, describes current settings for the Field of View control. The effective range is 1 to 180°, and the default value is 60°.
Click on the OK icon to exit the dialog.