视角 FOV 计算

🧮 Field of View (FOV) Calculator

Calculate horizontal, vertical and diagonal field of view from focal length and sensor dimensions.

📐 计算公式与说明

相机视场角:水平 FOV = 2·atan(传感器宽 ÷ (2×焦距)) × 180÷π(°);垂直 FOV = 2·atan(传感器高 ÷ (2×焦距)) × 180÷π(°)。校验:焦距、传感器宽/高三项非空守卫(无分母项)。判据:无固定分级,焦距越长视角越窄,算例 50mm 镜头配 36mm 全幅 → 水平约 39.6°。

传感器越宽、焦距越短,视角越大。

📚 深度解析:视场角(水平/垂直)计算

💡 常见使用场景

50mm 全幅
全幅 36×24mm、50mm:水平 FOV = 2×atan(36/(2×50)) ≈ 39.6°,垂直 = 2×atan(24/100) ≈ 27°,对角 ≈ 46.8°。
广角对比
24mm 水平 FOV ≈ 73.7°,比 50mm 宽近一倍,适合风光建筑;200mm 仅约 10° 长焦压缩。

❓ 常见问题(FAQ)

视角和焦距什么关系?
焦距越短视角越宽,FOV = 2×atan(传感器尺寸/(2f));画幅越大同焦距视角越宽。
水平垂直为什么不同?
传感器宽大于高,故水平视角大于垂直;非平方画幅需分别算。

Formula & Standard References

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