Calculate the angle of view from focal length and sensor size to visualise how much of the scene a lens captures.
全画幅默认 36×24 mm。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Three angles | Horizontal, vertical and diagonal angles use 36 mm, 24 mm and 43.27 mm respectively | ISO 12231:2012 Photography — Vocabulary |
| Projection type | Rectilinear gives FOV = 2 arctan(d/2f), while fisheye equidistant projection uses FOV = d/f in radians | Kingslake, Optics in Photography, SPIE Press, 1992 |
| Specification basis | Vendors usually quote diagonal coverage, so compare framing by converting to horizontal | ISO 12231:2012 Photography — Vocabulary |