![]() Additionally, a shorter working distance is needed to obtain the same FOV compared to a longer focal length lens. Thus, the lens focal length defines the AFOV and FOV.įor a given sensor size, a shorter focal length gives a wider AFOV and, therefore, a larger FOV and vice versa. The fixed focal length lens can be focused for different working distances to obtain differently sized FOV, even though the viewing angle remains constant. A fixed focal length lens is not the same as a fixed focus lens, which can only be used at a fixed working distance. It is required to calculate the overall FOV. AFOV is the angle of light that can be captured by the lens. The focal length of a lens is the distance between the lens and the focused image on the sensor.Ī fixed focal length lens provides a fixed angular FOV (AFOV). The camera lens, its focal length and the sensor size all play a part in determining the FOV. It is measured horizontally, vertically and diagonally. The wider the FOV, the more one can see of the observable world. FOV also describes the angle through which a person can see the visible world. It refers to the coverage of an entire area rather than a single, fixed focal point. In other words, it answers the question: "How much can the device see?" Field of view explainedįOV is the range of the observable world visible at any given time through the human eye, a camera viewfinder or on a display screen. In the case of optical devices, FOV is the maximum area that the device can capture. Field of view (FOV) is the open, observable area a person can see through their eyes or via an optical device, such as a camera.
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