f/13
Aperture
7.4
Stops less light than f/1
0.59%
Light vs f/1
3.50 m
DoF: 50 mm at 3 m (FF)
17.4 µm
Airy disk diameter
Depth of field at f/13 (full frame)#
| Focal | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal |
|---|---|---|---|---|---|
| 16 mm | ∞ | ∞ | ∞ | ∞ | 67.2 cm |
| 24 mm | 2.35 m | ∞ | ∞ | ∞ | 1.50 m |
| 35 mm | 67.8 cm | 4.11 m | ∞ | ∞ | 3.18 m |
| 50 mm | 30.3 cm | 1.34 m | 19.1 m | ∞ | 6.46 m |
| 85 mm | 9.9 cm | 41.8 cm | 2.85 m | 15.0 m | 18.6 m |
| 135 mm | 3.7 cm | 16.0 cm | 1.05 m | 4.42 m | 46.9 m |
| 200 mm | 1.6 cm | 7.0 cm | 46.9 cm | 1.93 m | 103 m |
Diffraction at f/13#
Diffraction softening becomes visible at 100% once the Airy disk spans more than about two pixels. It is a gradual effect, not a cliff.
| Sensor | Pixel pitch | Airy disk / pixel | Pixel-level sharpness |
|---|---|---|---|
| Full frame 24 MP | 6.00 µm | 2.9× | slight softening |
| Full frame 45 MP | 4.39 µm | 4.0× | diffraction-limited |
| Full frame 61 MP | 3.79 µm | 4.6× | diffraction-limited |
| APS-C 24 MP | 3.92 µm | 4.5× | diffraction-limited |
| APS-C 40 MP | 3.04 µm | 5.7× | diffraction-limited |
| Micro Four Thirds 20 MP | 3.34 µm | 5.2× | diffraction-limited |
| 1-inch 20 MP | 2.41 µm | 7.2× | diffraction-limited |
| Smartphone 1/1.3" 50 MP | 1.17 µm | 14.9× | diffraction-limited |
f/13 on smaller sensors equals…#
Exposure (brightness) is the same at a given f-number on every format; equivalence describes depth of field and total light.
| Used on | Full-frame equivalent depth of field |
|---|---|
| APS-C (1.5×) | f/19.5 |
| Canon APS-C (1.6×) | f/20.8 |
| Micro Four Thirds (2×) | f/26.0 |
| 1-inch (2.7×) | f/35.1 |
Shutter speed at f/13#
| Light | ISO 100 | ISO 400 | ISO 1600 | ISO 6400 |
|---|---|---|---|---|
| EV 15 · Bright sun, distinct shadows (Sunny 16) | 1/200 s | 1/800 s | 1/3200 s | too bright |
| EV 13 · Cloudy-bright, no shadows | 1/50 s | 1/200 s | 1/800 s | 1/3200 s |
| EV 12 · Heavy overcast / open shade | 1/25 s | 1/100 s | 1/400 s | 1/1600 s |
| EV 10 · Just after sunset | 1/6 s | 1/25 s | 1/100 s | 1/400 s |
| EV 8 · Bright interior, city street at night | 0.6 s | 1/6 s | 1/25 s | 1/100 s |
| EV 5 · Home interior at night | 5 s | 1.3 s | 0.3 s | 1/13 s |
| EV 2 · Distant city lights | 30 s | 10 s | 2.5 s | 0.6 s |
| EV -2 · Moonlit landscape | > 4 min | 2 min | 30 s | 10 s |
When to use f/13#
f/13 is a go-to setting for landscapes and architecture needing front-to-back sharpness on full frame, and sunstars.
Other apertures#
Frequently asked questions#
Is f/13 a wide aperture?
No — f/13 is a small (narrow) aperture. Smaller numbers mean larger openings.
How much light does f/13 let in compared to f/2.8?
0.05× (-4.4 stops).
Last updated October 03, 2026 · How we calculate · Sources