f/1.1
Aperture
0.3
Stops less light than f/1
82.64%
Light vs f/1
23.4 cm
DoF: 50 mm at 3 m (FF)
1.5 µm
Airy disk diameter
Depth of field at f/1.1 (full frame)#
| Focal | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal |
|---|---|---|---|---|---|
| 16 mm | 25.8 cm | 1.09 m | 10.9 m | ∞ | 7.77 m |
| 24 mm | 11.2 cm | 45.9 cm | 3.10 m | 17.0 m | 17.5 m |
| 35 mm | 5.2 cm | 21.2 cm | 1.36 m | 5.79 m | 37.2 m |
| 50 mm | 2.5 cm | 10.3 cm | 65.6 cm | 2.67 m | 75.8 m |
| 85 mm | 0.8 cm | 3.5 cm | 22.5 cm | 90.8 cm | 219 m |
| 135 mm | 0.3 cm | 1.4 cm | 8.8 cm | 35.7 cm | 552 m |
| 200 mm | 0.1 cm | 0.6 cm | 4.0 cm | 16.2 cm | 1.2 km |
Diffraction at f/1.1#
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 | 0.2× | no visible loss |
| Full frame 45 MP | 4.39 µm | 0.3× | no visible loss |
| Full frame 61 MP | 3.79 µm | 0.4× | no visible loss |
| APS-C 24 MP | 3.92 µm | 0.4× | no visible loss |
| APS-C 40 MP | 3.04 µm | 0.5× | no visible loss |
| Micro Four Thirds 20 MP | 3.34 µm | 0.4× | no visible loss |
| 1-inch 20 MP | 2.41 µm | 0.6× | no visible loss |
| Smartphone 1/1.3" 50 MP | 1.17 µm | 1.3× | no visible loss |
f/1.1 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/1.7 |
| Canon APS-C (1.6×) | f/1.8 |
| Micro Four Thirds (2×) | f/2.2 |
| 1-inch (2.7×) | f/3.0 |
Shutter speed at f/1.1#
| Light | ISO 100 | ISO 400 | ISO 1600 | ISO 6400 |
|---|---|---|---|---|
| EV 15 · Bright sun, distinct shadows (Sunny 16) | too bright | too bright | too bright | too bright |
| EV 13 · Cloudy-bright, no shadows | 1/6400 s | too bright | too bright | too bright |
| EV 12 · Heavy overcast / open shade | 1/3200 s | too bright | too bright | too bright |
| EV 10 · Just after sunset | 1/800 s | 1/3200 s | too bright | too bright |
| EV 8 · Bright interior, city street at night | 1/200 s | 1/800 s | 1/3200 s | too bright |
| EV 5 · Home interior at night | 1/25 s | 1/100 s | 1/400 s | 1/1600 s |
| EV 2 · Distant city lights | 0.3 s | 1/13 s | 1/50 s | 1/200 s |
| EV -2 · Moonlit landscape | 5 s | 1.3 s | 0.3 s | 1/13 s |
When to use f/1.1#
f/1.1 is a go-to setting for low light, shallow depth of field, creamy bokeh and subject isolation — the classic portrait and night-street aperture.
Other apertures#
Frequently asked questions#
Is f/1.1 a wide aperture?
Yes — f/1.1 is a wide (fast) aperture that lets in lots of light. Smaller numbers mean larger openings.
How much light does f/1.1 let in compared to f/2.8?
6.48× (+2.7 stops).
Last updated October 03, 2026 · How we calculate · Sources