Burst mode, also called continuous shooting, is a camera drive setting that records a rapid sequence of frames for as long as the shutter button is held down. Its speed is stated in frames per second (fps), and its practical length is set by the camera’s memory buffer and the write speed of the memory card. In camera mechanics, it is the result of several systems working together: the shutter, the sensor readout, the autofocus and the image processor.
Photographers use burst mode to capture decisive moments that last only a fraction of a second, such as a ball leaving a racket, a bird taking off or a fleeting facial expression. It increases the chance of a perfect frame, but it also multiplies the number of files to store and review.
How burst mode works inside the camera
Each frame in a burst follows the same cycle: expose, read out the sensor, process and store. With a mechanical shutter, the curtains must close, re-cock and open again, and in a DSLR the mirror must also flip up and down, which physically limits the frame rate. With an electronic shutter, there is no moving part, so the limit becomes the sensor readout speed and the processing power.
Images first go into a fast internal buffer, a block of memory that holds frames before they are written to the card. When the buffer is full, the frame rate drops sharply or stops until enough data has been written. Buffer depth is therefore stated as a number of frames for a given file type, and it is often much lower for uncompressed raw files than for JPEGs.
| Component | Role in a burst | Typical constraint |
|---|---|---|
| Mechanical shutter | Physically opens and closes for each frame | About 5 to 15 fps on most bodies |
| Electronic shutter | Reads the sensor without moving parts | Readout speed, rolling shutter distortion |
| Autofocus system | Recalculates focus between frames | May force a lower rate in tracking modes |
| Image processor | Converts and compresses each frame | Heat and processing time |
| Buffer | Temporarily stores frames | Fills after a set number of frames |
| Memory card | Receives frames from the buffer | Write speed decides recovery time |
Typical burst speeds and drive modes
Most cameras offer several continuous drive modes, commonly labeled low, high and sometimes high plus, so the photographer can trade speed against file count and viewfinder behavior. Lower rates often provide a live view between frames, while the fastest rates may show a brief blackout or a delayed preview on older systems.
| Camera class | Mechanical shutter | Electronic shutter |
|---|---|---|
| Entry-level DSLR | About 3 to 6 fps | Usually only in live view, if available |
| Midrange mirrorless | About 8 to 15 fps | About 15 to 30 fps |
| Professional sports body | About 12 to 20 fps | About 20 to 120 fps |
| Smartphone | Not applicable | Often 10 to 30 fps, sometimes continuous capture |
Published maximum rates often apply only under specific conditions: a particular lens, a fixed focus or exposure, a certain shutter type or a reduced bit depth. The sustained rate with continuous autofocus and full-quality raw files can be noticeably lower.
Burst mode compared with pre-capture and video
Burst mode is one of several ways to catch a fast moment. Pre-capture continuously buffers frames while the shutter button is half-pressed and saves a short period before the full press, which compensates for human reaction time. Extracting stills from high-resolution video gives a continuous record, but usually with smaller files and video-style compression.
| Method | What is recorded | Main advantage | Main drawback |
|---|---|---|---|
| Burst mode | Full-resolution stills while the button is held | Best image quality per frame | Starts only after the press |
| Pre-capture | Frames from before and after the press | Beats reaction time and shutter lag | Many unwanted frames, more power use |
| Video frame grab | Continuous video frames | No gaps between frames | Lower resolution, compression, motion blur |
| Single shot | One frame per press | Fewest files, deliberate timing | Depends entirely on the photographer’s timing |
Using burst mode effectively
Effective continuous shooting relies on short, targeted bursts rather than holding the button for long periods. Firing three to eight frames around the expected peak of the action keeps the buffer free for the next moment and reduces time spent culling.
- Use a fast card that matches the camera’s interface, so the buffer clears quickly.
- Choose the file format deliberately: compressed raw or JPEG may give a much deeper buffer.
- Combine burst with continuous autofocus and a suitable tracking area for moving subjects.
- Set a fast enough shutter speed, often 1/1000 s or faster for sports, since more frames cannot fix motion blur.
- Watch for rolling shutter distortion with electronic shutters on fast pans or spinning objects.
- Avoid bursts under flickering artificial light unless the camera offers anti-flicker timing.
Limitations and side effects
Burst mode has costs that are easy to underestimate. A one-second burst at 20 fps produces 20 files, so a sports event can generate thousands of images to review. Mechanical bursts add to the shutter count, and repeated long bursts can raise sensor temperature and drain the battery faster.
Flash photography is another constraint. Most flash units cannot recycle quickly enough for high frame rates at full power, so burst rates drop or later frames come out underexposed. Some cameras also lock exposure or focus after the first frame at the highest speed, which can produce a sequence of identical errors.
The short version
Burst mode turns the camera into a very fast sequence of single photos. Hold the button, and it keeps shooting several times per second until you let go or its memory fills up.
It is useful when something happens too quickly to time with one press. Out of a short burst, at least one frame is likely to show the exact moment you wanted. The catch is that you then have many similar photos to sort through.
Where it makes a difference
A photographer covers a school long jump competition with a mirrorless camera and a 70-200 mm lens. She sets 1/1600 s, f/4 and automatic ISO, continuous autofocus with subject tracking, and the high continuous mode at 15 fps with a mechanical shutter to avoid rolling shutter distortion on the athletes’ fast-moving limbs.
For each jump she starts a burst about half a second before take-off and stops after landing, which gives about 20 frames per attempt. The buffer of about 60 compressed raw frames never fills, because a fast card clears it between jumps. During selection she keeps one or two frames per athlete: the moment of full extension above the sand. A single-shot approach would have missed that peak for most jumpers, while short, targeted bursts captured it reliably.