Optics calculators
Field of view calculator
Calculate horizontal, vertical and diagonal angles, frame width and height, and the distance needed to fit a subject.
Frame coverage at your distance
3.717 m × 2.483 m
Canon EOS R50 · 18 mm · f/4.5 · 3 m
- Horizontal angle
- 63.552°
- Vertical angle
- 44.968°
- Diagonal angle
- 73.372°
- Distance to fit your subject height (camera held horizontally)
- 2.054 m
- Distance to fit your subject height (camera held vertically)
- 1.372 m
Sources for these settings
- Sensor dimensions: Canon source · Updated 2 Oct 2026
- Focal range: Canon USA source · Updated 7 Sep 2026
- Widest aperture: Canon USA source · Updated 7 Sep 2026
- Smallest aperture: Canon source · Updated 2 Oct 2026
- Minimum focus: Canon Europe source · Updated 5 Oct 2026
What these numbers mean
These are geometric estimates, not a sharpness test. The thin-lens model does not account for focus breathing, lens distortion or close-up magnification. Focus distance is entered from the camera’s sensor plane; the model approximates it as distance from the lens.
Depth of field uses a circle of confusion: a chosen acceptable blur diameter on the sensor. It is not a guarantee that a photograph will look sharp at every print size. Equivalent focal length compares framing; equivalent aperture compares depth of field at matched framing and distance, and does not change exposure.
Named zooms with variable aperture limits use their published endpoints. Intermediate limits stay unknown. Intermediate depth-of-field settings have unchecked lens limits.