A global shutter exposes the whole sensor at the same instant, while a rolling shutter reads the sensor line by line from top to bottom. For video, that means a global shutter avoids skewed motion, and for flash, it can make high-speed sync easier because the entire frame is exposed together.
How Each Works
- Rolling shutter: each row of pixels is read a fraction of a moment after the one above. Fast-moving subjects or quick camera moves can lean or wobble.
- Global shutter: every pixel begins and ends collecting light together, so fast motion keeps its shape.
- Mechanical shutter: many stills cameras also have a physical shutter that exposes the frame with moving curtains, which has its own sync limits.
Effects on Video
- Skew: when you pan fast, vertical lines can tilt on a rolling shutter sensor.
- Jello effect: handheld vibration or a shaky mount can make the image wobble.
- Partial flash frames: a short flash, such as a camera flash or lightning, may light only part of a frame on a rolling shutter.
- Banding: under flickering lights, rolling shutter can show bands, so match shutter speed to local mains frequency, for example 1/50 or 1/60 as a baseline.
Cameras with faster sensor readout reduce these problems even without a true global shutter. Slower readout shows them more.
Effects on Flash Sync
With a mechanical shutter, flash sync is limited by how fast the curtains travel, so standard sync speeds are usually modest, often around 1/200 to 1/250 on many cameras. Beyond that, you rely on high-speed sync, which pulses the flash and loses power. With an electronic global shutter, the sensor can expose the full frame at once, which can allow faster sync with strobes. Results depend on the camera model, so check the maker’s notes.
On a rolling electronic shutter, a flash may only light part of the frame, so most photographers use the mechanical or an electronic first-curtain mode for flash.
Which Matters for You
| Use | Importance of global shutter |
|---|---|
| Fast sports and panning video | High |
| Studio flash at high shutter speeds | Helpful where supported |
| Landscape and portraits | Low |
| Interviews and static video | Low |
FAQ
Do all mirrorless cameras have a global shutter?
No. Most use a rolling electronic shutter plus a mechanical one. Global shutter sensors exist in a smaller number of models, so confirm on the maker’s page.
Can I reduce rolling shutter without a global sensor?
Yes. Pan slowly, stabilize the camera, use a faster readout mode if available, and avoid shooting fast action with a high-crop mode that slows readout.
The Short Version
Global shutter exposes the full frame at once and avoids skew, partial flash frames and wobble. Rolling shutter is more common and fine for most work. Choose global shutter if you shoot fast action, strobes or video with quick camera moves.
