Optics calculator

Field of view calculator

How wide and high the frame is at your distance, the angles of view, and how far back to stand to fit your subject.

Camera

Lens

Focal length (mm)

Aperture (f-number)

Distance

Unit

Subject height (in the distance unit)

Sharpness convention and framing

Circle of confusion

Your circle of confusion (mm)

The equivalent focal length you want (mm)

The frame covers, 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°
Stand this far back to fit the subject (camera level): 2.054 m
Stand this far back to fit the subject (camera upright): 1.372 m

EOS R50 lenses This lens Build a kit with it

Sensor sizes and crop factors

The crop factor is the full-frame diagonal (43.3 mm) divided by the sensor's diagonal. Makers round it: Canon quotes 1.6, Sony, Nikon and Fujifilm 1.5.

Format	Size	Crop factor	50 mm frames like	Examples
Medium format (44 × 33)	43.8 × 32.9 mm	0.79×	39 mm	Fujifilm GFX cameras
Full frame (35 mm)	36 × 24 mm	1.00×	50 mm	Canon EOS R6, Sony a7, Nikon Z6, the reference format
APS-C (Sony, Nikon DX, Fujifilm)	23.5 × 15.6 mm	1.53×	77 mm	Sony a6400, Nikon Z50II, Fujifilm X-T5
APS-C (Canon)	22.3 × 14.9 mm	1.61×	81 mm	Canon EOS R50, R10, R7
Micro Four Thirds	17.3 × 13 mm	2.00×	100 mm	Panasonic Lumix G and OM System cameras
1-inch type	13.2 × 8.8 mm	2.73×	136 mm	Sony RX100 and many bridge cameras
1/1.3-inch type	9.6 × 7.2 mm	3.61×	180 mm	Large phone main cameras
1/2.3-inch type	6.17 × 4.55 mm	5.64×	282 mm	Small compacts and action cameras

Our APS-C cameras

Camera	Sensor	Maker's crop
Canon EOS R100	22.3 × 14.9 mm	1.6×
Canon EOS R50	22.3 × 14.9 mm	1.6×
Canon EOS R50 V	22.3 × 14.9 mm	1.6×
Canon EOS R10	22.3 × 14.9 mm	1.6×
Canon EOS R7	22.3 × 14.8 mm	1.6×
Sony a6000	23.5 × 15.6 mm	1.5×
Sony a6100	23.5 × 15.6 mm	1.5×
Sony a6400	23.5 × 15.6 mm	1.5×
Sony a6600	23.5 × 15.6 mm	1.5×
Sony a6700	23.3 × 15.5 mm	1.5×
Sony ZV-E10	23.5 × 15.6 mm	1.5×
Sony ZV-E10 II	23.3 × 15.5 mm	1.5×
Sony FX30	23.3 × 15.5 mm	1.5×
Nikon Z30	23.5 × 15.7 mm	1.5×
Nikon Z50	23.5 × 15.7 mm	1.5×
Nikon Z50II	23.5 × 15.7 mm	1.5×
Nikon Z fc	23.5 × 15.7 mm	1.5×
Fujifilm X-T5	23.5 × 15.7 mm	1.5×
Fujifilm X-T50	23.5 × 15.7 mm	1.5×
Fujifilm X-T30 III	23.5 × 15.6 mm	1.5×
Fujifilm X-T30 II	23.5 × 15.6 mm	1.5×
Fujifilm X-S20	23.5 × 15.6 mm	1.5×
Fujifilm X-S10	23.5 × 15.6 mm	1.5×
Fujifilm X-M5	23.5 × 15.6 mm	1.5×
Fujifilm X-E5	23.5 × 15.7 mm	1.5×
Fujifilm X-E4	23.5 × 15.6 mm	1.5×
Fujifilm X-H2	23.5 × 15.6 mm	1.5×
Fujifilm X-H2S	23.5 × 15.6 mm	1.5×
Fujifilm X-T4	23.5 × 15.6 mm	1.5×
Fujifilm X-Pro3	23.5 × 15.6 mm	1.5×

How the numbers are worked out

These are geometric estimates from the thin-lens model, not a sharpness test. They leave out focus breathing, distortion and close-up magnification; distance is measured from the sensor.

Depth of field depends on the circle of confusion: the blur diameter on the sensor you accept as sharp. Equivalent focal length compares framing with full frame; equivalent aperture compares depth of field at the same framing and distance, and never changes exposure.

Where the inputs come from

Sensor sizes and crop factors are each camera maker's. Focal ranges, the widest apertures at the ends of a zoom and closest focus distances are each lens maker's, checked 2026-10-09. A zoom's widest aperture between its ends is not published, so it is not checked there.

Formulas and assumptions

Questions

How far back do I need to stand for a group photo?

Enter the group's height or width as the subject height and read the distance under the result. With the camera level, a 24 mm-equivalent view fits a 1.7 m standing person from about 1.7 m away; a 75 mm-equivalent view needs about 5.3 m.

Does the crop factor change the field of view?

Yes. The same lens frames a narrower view on an APS-C sensor than on full frame: 1.5 times narrower on Sony, Nikon and Fujifilm, 1.6 times on Canon.

What is the difference between horizontal and diagonal angle of view?

Makers usually quote the diagonal angle, the widest of the three. The horizontal angle tells you what fits side to side in a landscape photo.