Calculate horizontal, vertical and diagonal field of view from focal length and sensor dimensions.
传感器越宽、焦距越短,视角越大。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Angle of view | FOV = 2 × arctan(d ÷ 2f), applied to horizontal, vertical and diagonal dimensions | ISO 12231:2012 Photography — Vocabulary |
| Frame dimensions | Full frame measures 36 mm horizontally, 24 mm vertically and 43.27 mm diagonally | ISO 1007:2000 Photography — 135-size film and magazine |
| Angle versus focal length | Doubling focal length roughly halves the angle only at small angles; wide lenses need the exact formula | ISO 12231:2012 Photography — Vocabulary |