f/7.1
Aperture
5.7
Stops less light than f/1
1.98%
Light vs f/1
1.61 m
DoF: 50 mm at 3 m (FF)
9.5 µm
Airy disk diameter
Depth of field at f/7.1 (full frame)#
| Focal | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal |
|---|---|---|---|---|---|
| 16 mm | 4.97 m | ∞ | ∞ | ∞ | 1.22 m |
| 24 mm | 83.0 cm | 6.27 m | ∞ | ∞ | 2.73 m |
| 35 mm | 34.5 cm | 1.55 m | 33.9 m | ∞ | 5.79 m |
| 50 mm | 16.3 cm | 68.3 cm | 5.13 m | 60.3 m | 11.8 m |
| 85 mm | 5.4 cm | 22.7 cm | 1.48 m | 6.39 m | 34.0 m |
| 135 mm | 2.0 cm | 8.7 cm | 57.0 cm | 2.34 m | 85.7 m |
| 200 mm | 0.9 cm | 3.8 cm | 25.6 cm | 1.05 m | 188 m |
Diffraction at f/7.1#
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 | 1.6× | no visible loss |
| Full frame 45 MP | 4.39 µm | 2.2× | slight softening |
| Full frame 61 MP | 3.79 µm | 2.5× | slight softening |
| APS-C 24 MP | 3.92 µm | 2.4× | slight softening |
| APS-C 40 MP | 3.04 µm | 3.1× | slight softening |
| Micro Four Thirds 20 MP | 3.34 µm | 2.9× | slight softening |
| 1-inch 20 MP | 2.41 µm | 3.9× | diffraction-limited |
| Smartphone 1/1.3" 50 MP | 1.17 µm | 8.1× | diffraction-limited |
f/7.1 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/10.6 |
| Canon APS-C (1.6×) | f/11.4 |
| Micro Four Thirds (2×) | f/14.2 |
| 1-inch (2.7×) | f/19.2 |
Shutter speed at f/7.1#
| Light | ISO 100 | ISO 400 | ISO 1600 | ISO 6400 |
|---|---|---|---|---|
| EV 15 · Bright sun, distinct shadows (Sunny 16) | 1/640 s | 1/2500 s | too bright | too bright |
| EV 13 · Cloudy-bright, no shadows | 1/160 s | 1/640 s | 1/2500 s | too bright |
| EV 12 · Heavy overcast / open shade | 1/80 s | 1/320 s | 1/1250 s | 1/5000 s |
| EV 10 · Just after sunset | 1/20 s | 1/80 s | 1/320 s | 1/1250 s |
| EV 8 · Bright interior, city street at night | 1/5 s | 1/20 s | 1/80 s | 1/320 s |
| EV 5 · Home interior at night | 1.6 s | 0.4 s | 1/10 s | 1/40 s |
| EV 2 · Distant city lights | 13 s | 3.2 s | 0.8 s | 1/5 s |
| EV -2 · Moonlit landscape | 4 min | 1 min | 13 s | 3.2 s |
When to use f/7.1#
f/7.1 is a go-to setting for the sharpest zone of most lenses — groups, travel, street ("f/8 and be there") and landscapes on smaller sensors.
Other apertures#
Frequently asked questions#
Is f/7.1 a wide aperture?
It is a medium aperture. Smaller numbers mean larger openings.
How much light does f/7.1 let in compared to f/2.8?
0.16× (-2.7 stops).
Last updated October 03, 2026 · How we calculate · Sources