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Camera horizontal field of view
Estimate a rectilinear lens’s horizontal angle from focal length and active sensor width.
Focal length (mm): 0.5–2000; Active sensor width (mm): 1–100
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Camera horizontal field of view
Focal length (mm): 50 Active sensor width (mm): 36
- Horizontal angle of view (°)
- 39.597753
- Horizontal crop factor versus 36 mm width
- 1.000000
- Equivalent focal length at 36 mm width (mm)
- 50.000000
Horizontal angle = 2 atan(w/(2f)), converted from radians to degrees. Horizontal crop factor = 36/w; equivalent focal length = f × 36/w. Use focal length f and active horizontal sensor width w in millimetres, not sensor diagonal or optical-format inch designation. This rectilinear geometric model excludes lens distortion, fisheye/anamorphic optics, focus breathing, finite-focus changes, stabilisation and digital crops unless reflected in active width. The 36 mm comparison matches horizontal framing only, not diagonal field, depth of field, exposure or image quality. Check the camera mode and lens data.
Methodology
How it works
Horizontal angle = 2 atan(w/(2f)), converted from radians to degrees. Horizontal crop factor = 36/w; equivalent focal length = f × 36/w. Use focal length f and active horizontal sensor width w in millimetres, not sensor diagonal or optical-format inch designation. This rectilinear geometric model excludes lens distortion, fisheye/anamorphic optics, focus breathing, finite-focus changes, stabilisation and digital crops unless reflected in active width. The 36 mm comparison matches horizontal framing only, not diagonal field, depth of field, exposure or image quality. Check the camera mode and lens data.
Method and assumptions documented by Techrider.live
2026-10-26
Frequently asked questions
Does a crop factor change the real focal length?
No. It compares horizontal framing with a 36 mm-wide reference. A 50 mm lens and 36 mm active width give about 39.597753°; the same lens on 18 mm width gives about 20.407947° and a 100 mm horizontal equivalent.