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The field of view is a measure of how large an area the camera is capable of viewing. The focal length of the lens affects the field of view.
A shorter focal length lens captures more of the scene and therefore displays a larger field of view. Conversely, a longer lens magnifies the scene more, thereby decreasing the field of view.
How large of an area do you want to view with the camera?
Below are examples of how lens choices affect the field of view. Use these examples to help you decide what field of view your application requires.