What 1/400 s is good for#
A shutter speed of 1/400 s is typically used for everyday handheld photography, street scenes and walking people.
Each step on the standard scale is ⅓ stop; doubling the time adds one stop of light. 1/400 s lets in 3.2× less light than 1/125 s.
Will 1/400 s freeze the motion?#
Image-plane blur for subjects crossing the frame at a right angle. Under ~2 pixels looks sharp; panning with the subject reduces blur dramatically.
| Subject | Blur on a 24 MP full-frame sensor | Result |
|---|---|---|
| Person walking (5 km/h, 5 m away, 50 mm) | 5.8 px | slight blur |
| Child running (11 km/h, 4 m, 50 mm) | 15.6 px | motion blur |
| Jogger (12 km/h, 10 m, 85 mm) | 11.7 px | motion blur |
| Cyclist (30 km/h, 10 m, 70 mm) | 24.2 px | motion blur |
| Dog sprinting (40 km/h, 10 m, 200 mm) | 91.7 px | motion blur |
| Car (50 km/h, 20 m, 50 mm) | 14.6 px | motion blur |
| Bird in flight (36 km/h, 20 m, 400 mm) | 83.3 px | motion blur |
| Race car (200 km/h, 50 m, 300 mm) | 137.5 px | motion blur |
| Waterfall / fast water (2 m/s, 5 m, 35 mm) | 5.8 px | slight blur |
Aperture to use at 1/400 s#
Correct exposure at 1/400 s for typical lighting, rounded to ⅓ stop.
| Light | ISO 100 | ISO 400 | ISO 1600 | ISO 6400 |
|---|---|---|---|---|
| EV 15 · Bright sun, distinct shadows (Sunny 16) | f/9 | f/18 | f/32 | too bright |
| EV 13 · Cloudy-bright, no shadows | f/4.5 | f/9 | f/18 | f/32 |
| EV 12 · Heavy overcast / open shade | f/3.2 | f/6.3 | f/13 | f/25 |
| EV 10 · Just after sunset | f/1.6 | f/3.2 | f/6.3 | f/13 |
| EV 8 · Bright interior, city street at night | too dark | f/1.6 | f/3.2 | f/6.3 |
| EV 5 · Home interior at night | too dark | too dark | f/1.1 | f/2.2 |
| EV 2 · Distant city lights | too dark | too dark | too dark | too dark |
| EV -2 · Moonlit landscape | too dark | too dark | too dark | too dark |
Exposure calculator#
Your metered (or known good) exposure
New settings — change aperture and/or ISO, we solve the shutter speed
Nearby shutter speeds#
Frequently asked questions#
Is 1/400 s fast enough to handhold?
On full frame, the reciprocal rule says 1/400 s works handheld up to about 400 mm without stabilisation, or ~6400 mm with 4 stops of image stabilisation. On APS-C divide by 1.5, on Micro Four Thirds by 2.
How many stops is 1/400 s from 1/125?
1.7 stops faster (less light).
Last updated October 03, 2026 · How we calculate · Sources