Photography Calculators

Sensor & focal length

Angle of View Calculator: Canon EOS R7 + Fujifilm XF 35mm f/1.4 R

Angle of view is how many degrees the rectangle drinks in. Horizontal is what you feel when you pan; diagonal is what lens ads quote. This is the rectilinear thin-lens formula — fisheyes and heavy distortion will not match. Check a test shot if the walls need to stay straight. This page is pre-filled for the Canon EOS R7 + Fujifilm XF 35mm f/1.4 R (APS-C (Canon), 32.5 MP, 35 mm at f/1.4).

Inputs

Units
mm

Barrel focal length at the focus distance you will use.

mm

Horizontal photosite width.

mm

Vertical photosite height. Flip these if you shoot portrait.

Results

Horizontal angle of view
35.34°
Vertical angle of view
23.88°
Diagonal angle of view
41.85°

Recommended gear

Calculation method

For a rectilinear lens the angle that a sensor dimension subtends is twice the arctangent of half that dimension over the focal length. Do it once for width, once for height, and once for the diagonal (hypotenuse of the sensor). A 50 mm on 36 mm-wide full frame is about 39.6° horizontal. Units of millimetres cancel; do not mix in crop factor on top of a crop sensor size.

Exact formula

α = 2 arctan(dim / (2f)) in degrees. Diagonal dim = √(w²+h²). Limits: Rectilinear thin lens; fisheye mapping, distortion, focus breathing and pupil shift omitted.

Cinema sensors

Open Gate, 16:9 and anamorphic desqueeze all change the recorded rectangle. Use the active pixel area in millimetres, not the stills full-sensor spec, if you are framing video.

Focus breathing

Many stills lenses narrow at minimum focus. Macro and some cheap zooms are the worst. Infinity angles are the optimistic ones.

Frequently asked questions

Why is this narrower than the box says?

Ads quote diagonal on full frame, often at infinity. Close focus, a crop mode or an APS-C body all shrink the angle. Type the sensor you actually record.

Portrait orientation?

Swap width and height. ‘Horizontal’ then means the long side of a vertical frame, which is what you pan along when you shoot a person.

Fisheye?

Fisheyes are not arctan. A 8 mm circular fisheye can see ~180° by design. This calculator will under-read; do not use it for fisheye coverage.

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