Field angle意思

"Field angle" is a term used in various contexts, but it is most commonly associated with optics and photography. In these fields, field angle refers to the angular extent of the view that a lens can capture or the angle at which a light beam spreads out from a point source.

In photography, field angle is another term for the angle of view, which is the extent of the scene that a camera's lens can capture. It is typically measured in degrees and depends on the focal length of the lens and the size of the image sensor. A wide-angle lens has a large field angle, allowing it to capture a wide scene, while a telephoto lens has a smaller field angle, zooming in on distant objects.

In the context of lighting, field angle refers to the angle at which a light beam spreads out from a point source. This can be important in determining the coverage area of a light fixture or the spread of a spotlight.

In other contexts, such as physics or engineering, field angle may refer to the angle at which a force or a field vector is directed with respect to a reference direction.