Free Field of View Calculator
Field of view is the angular extent of the scene a lens captures, set by the sensor size and focal length. Angle of view = 2 × atan(sensor ÷ (2 × focal length)). See exactly how much of the scene any lens sees on your camera — before you buy or frame.
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How field of view works
Field of view (angle of view) is set by two things: the sensor dimensions and the focal length. A 50 mm lens on full frame sees 39.6° horizontally; the same lens on APS-C sees about 26.5° — which is why crop sensors "crop" the frame (1.5× crop ≈ 75 mm equivalent).
The 35 mm equivalent is the focal length that would give the same framing on a full-frame body. It's how photographers compare lenses across sensor sizes: Micro 4/3 has a 2× crop, APS-C ≈ 1.5× (Canon ≈ 1.6×), phones ≈ 5-7×.
Worked example
You're choosing a lens for an indoor shoot and the room is 4 m across. With a full-frame body, a 24 mm lens (73.7° horizontal) frames the whole wall from about 2.8 m back, while a 35 mm (54.4°) needs ~4 m — the calculator tells you exactly which lens fits before you carry it there. The same math works in reverse for video: pick your shot size, then check whether your zoom range covers it at the working distance. This is also how you compare across sensor formats — a 23 mm lens on APS-C frames like 35 mm on full frame, and the calculator shows both angles side by side.
Field of view reference table (focal length × sensor)
Horizontal angle of view in degrees for each focal length and sensor format. Divide-by-two, roughly: a 24 mm lens on full frame sees about 74°, and the same lens on APS-C sees about 52° — which is why a 24 mm on a crop body frames like a 36 mm on full frame.
| Focal length | Full frame 36 × 24 mm | APS-C (1.5×) 23.5 × 15.6 mm | APS-C Canon (1.6×) 22.3 × 14.9 mm | Micro 4/3 17.3 × 13 mm | 1-inch 13.2 × 8.8 mm |
|---|---|---|---|---|---|
| 14 mm | 104.3° | 80.0° | 77.1° | 63.4° | 50.5° |
| 16 mm | 96.7° | 72.6° | 69.7° | 56.8° | 44.8° |
| 20 mm | 84.0° | 60.9° | 58.3° | 46.8° | 36.5° |
| 24 mm | 73.7° | 52.2° | 49.8° | 39.6° | 30.8° |
| 28 mm | 65.5° | 45.5° | 43.4° | 34.3° | 26.5° |
| 35 mm | 54.4° | 37.1° | 35.3° | 27.8° | 21.4° |
| 50 mm | 39.6° | 26.4° | 25.1° | 19.6° | 15.0° |
| 85 mm | 23.9° | 15.7° | 14.9° | 11.6° | 8.9° |
| 100 mm | 20.4° | 13.4° | 12.7° | 9.9° | 7.6° |
| 135 mm | 15.2° | 9.9° | 9.4° | 7.3° | 5.6° |
| 200 mm | 10.3° | 6.7° | 6.4° | 5.0° | 3.8° |
| 300 mm | 6.9° | 4.5° | 4.3° | 3.3° | 2.5° |
| 400 mm | 5.2° | 3.4° | 3.2° | 2.5° | 1.9° |
Values are horizontal angles of view computed as 2·atan(sensor width ÷ (2 × focal length)), rounded to 0.1°. Vertical and diagonal angles, and the 35 mm equivalent for your exact body, are in the calculator above.
Related tools & guides
Camera Sensor Sizes
Full sensor dimensions and crop factors, explained.
Open →Astro Pixel Scale Calculator
Arcsec/pixel sampling for your camera + scope.
Open →Focal Length Explained
What focal length actually does to your frame.
Open →Field of view FAQ
What's the difference between FOV and focal length?
Focal length is a property of the lens; field of view is the result on a given sensor. The same lens gives different FOV on different bodies. That's why "35 mm equivalent" exists.
How is field of view calculated?
FOV = 2 × atan(sensor dimension ÷ (2 × focal length)), in degrees. Horizontal uses sensor width, vertical uses height, diagonal uses the diagonal.
Does field of view change when I crop in post?
Yes — cropping changes the effective sensor area, so the FOV narrows exactly like using a longer lens. The calculator's distance fields show you the scene dimensions your final crop will cover.