Motion Blur Shutter Speed Calculator
Calculate shutter speed to freeze or intentionally blur motion.
Enter subject speed and focal length to get the right speed for sharp action photos.
Motion Blur Shutter Speed
Sharp motion freeze and intentional blur are two ends of a spectrum. The shutter speed needed depends on subject speed, focal length, subject distance, and direction of motion relative to the camera.
The “to freeze motion” rule of thumb: Shutter speed (sec) = 1 / (Subject speed in pixels per second)
Or for practical use, freezing motion typically needs:
| Subject | Direction | Shutter Speed |
|---|---|---|
| Walking person | toward / away | 1/30-1/60 |
| Walking person | sideways | 1/125-1/250 |
| Running person | sideways | 1/500-1/1000 |
| Cyclist (15-20 mph) | sideways | 1/500-1/1000 |
| Car (40 mph) | sideways | 1/1000-1/2000 |
| Bird in flight | sideways | 1/2000-1/4000 |
| Helicopter rotor (frozen) | n/a | 1/2000+ (freezes blades unnaturally) |
| Helicopter rotor (slight blur) | n/a | 1/250-1/500 |
| Hummingbird wings (frozen) | n/a | 1/4000+ |
| Bullet (frozen) | n/a | 1/8000+ flash; 1/4000 with flash sync |
Direction adjustment:
- Sideways motion: baseline shutter speed
- 45° angle: 1.5× faster shutter needed
- Toward / away: 2-4× SLOWER shutter OK (subject moves less in frame)
Focal length adjustment: Long lenses magnify motion blur. Reciprocal rule for handheld: Min shutter speed (handheld, no IS) = 1 / Focal length × Crop factor
E.g., 200mm lens on full frame: at least 1/200 sec for camera shake; with image stabilization (IS) you can go 4 stops slower.
For panning shots (intentional motion blur):
- Slow pan: 1/30-1/60 — strong streaks, fast subject blurry
- Medium pan: 1/60-1/125 — moderate streaks
- Fast pan: 1/125-1/250 — subtle blur, more keeper rate
Panning technique: track subject smoothly, press shutter mid-track, follow through after release.
For long exposures (waterfalls, light trails):
- Smooth water: 1/2 to 4 sec
- Moving clouds: 30 sec to several minutes
- Light trails (cars at night): 5-30 sec
- Star trails: 10-30 minutes (or stack many shorter exposures)
Image stabilization caveat:
- IBIS (in-body) and OIS (lens-based) help camera shake but not subject motion
- A 1/30 sec exposure may be sharp from camera shake but still motion-blurred from subject
- For sports / action: always prioritize fast shutter over IS
Auto-ISO trick for action: Set the camera to shutter priority + auto ISO for sports. ISO will rise to keep exposure correct as light changes, while you control freeze sharpness.
Burst mode: Action that’s hard to time (peak of jump, ball release): use 10+ fps burst at 1/2000+ to nail the decisive moment. Modern cameras do 30+ fps with electronic shutter.