Intervalometer and Time Lapse: What to Look For

What an intervalometer does

An intervalometer is a timer that triggers the camera shutter repeatedly at a set interval. In time lapse photography, the camera captures a still frame, waits a fixed amount of time, then captures the next frame. When the frames are played back as a sequence, movement that took minutes or hours appears compressed into seconds. The result is a video or an image sequence that reveals slow change: cloud movement, construction, crowds, plants growing, the night sky. Understanding shutter speed and frame rate helps you plan the final playback.

Virtually every interchangeable-lens camera line now includes built-in interval shooting. The feature appears under names like interval timer, interval shooting, or time lapse. On many cameras the assembled sequence can be rendered in-camera as a time lapse movie, usually in 4K. Some cameras also offer a separate time slice or time-lapse video mode that records short video clips at intervals instead of stills. For the highest quality, still-frame intervals are generally preferred because each frame uses the full sensor resolution and the full raw format bit depth.

A built-in intervalometer is not the same as a remote release with interval timing. An external intervalometer connects through a remote port and fires the shutter by simulating a button press. A built-in intervalometer works from the camera firmware, which gives it access to exposure settings, focus, and image processing that an external unit cannot control.

How interval shooting works

During interval shooting the camera runs on an internal clock. At each interval it wakes the sensor, meters the scene, applies exposure settings, takes a photo, writes the file to the memory card, and then goes back to a low-power state until the next interval. The exact wake-up time varies with the shutter mode, the drive mode, and how long the file takes to write. The interval is measured from the start of one exposure to the start of the next.

Most cameras let you set two values: the number of shots and the interval between shots. The interval is usually adjustable from one second to several minutes, and on many cameras up to 24 hours. The shot count can be capped at a few hundred or allowed to run up to 9999 frames, depending on the model. Some cameras also have an unlimited or continuous option that stops only when the card is full, the battery is exhausted, or the shutter is released manually.

The camera's exposure and focus settings affect how reliable the interval is. In shutter speed priority or manual mode, the exposure stays fixed across the sequence, which keeps brightness stable. In aperture or program mode the camera meters again for every frame, which causes exposure to drift as light changes. For most time lapse work, manual exposure or aperture priority with exposure lock is the safer choice.

The interval must be long enough for the camera to finish writing the image and reset the shutter before the next shot. If the interval is shorter than the write time, the camera may skip a frame or extend the interval automatically. On cameras that write large raw files to a slow card, a very short interval can cause dropped frames. Safer to choose an interval that allows a comfortable margin.

Battery life and power delivery matter in long sequences. Interval shooting wakes the sensor for every frame, so a run that lasts an hour or more can drain a standard battery. Cameras that can charge or run over USB during shooting can extend a sequence almost indefinitely, though the USB port must support power delivery while the camera is on. For overnight runs, an AC adapter or a camera battery grip is the usual choice. Review camera battery types and life to understand your options.

Interval range and frame count

The interval range determines what kinds of motion you can capture. A one to five second interval works for fast-moving clouds, traffic, crowds, or any subject where visible change happens within seconds. A 10 to 30 second interval suits slow cloud movement, shadows crossing a landscape, or the sun setting. For very slow processes like construction, plant growth, or stars moving across the sky, intervals of 30 seconds to several minutes are more useful.

The maximum frame count matters for two reasons: how long the sequence lasts and how much storage it consumes. At 30 frames per second playback, 300 frames make a 10-second clip. A minute-long time lapse needs 1800 frames. If a camera can only shoot 100 frames in one run, you either restart it or accept a shorter clip. Most current cameras allow at least several hundred frames; some allow thousands.

A related setting is the start delay or start timer, which tells the camera to wait a set time after you press the start button before the first frame. This lets you press the shutter, walk away, and have the sequence begin after you are clear of the frame. Not every camera includes it, but it is convenient for a one-person workflow.

Interval priority versus exposure priority

In auto exposure modes the camera recomputes exposure for every frame, which can cause brightness to change frame to frame. To prevent that, many cameras provide an interval priority or exposure priority option. Interval priority means the camera shoots at the set interval even if the exposure needs to change, at the cost of slight under- or overexposure in changing light. Exposure priority means the camera holds the interval but lets the exposure shift, which keeps each frame correctly exposed but can produce flicker in the sequence.

For time lapse, consistent exposure frame to frame is more important than perfect exposure in any single frame. A brief under- or overexposed frame stands out less than a sequence that pulses in brightness. Because of that, interval priority is often the better choice for daylight-to-dusk transitions, where the light level changes noticeably over the run. The exposure triangle is a good starting point to balance settings.

Flicker can also come from the aperture. Many lenses change the aperture in small steps, and those steps produce tiny exposure shifts that appear as flicker in the final video. Some cameras have a flicker reduction or anti-flicker mode that steadies exposure between frames. The feature is not universal, and its implementation varies by model, so it is worth checking the camera's specification sheet before you buy if flicker is a concern.

In-camera time lapse movie assembly

Many cameras can take the still frames from an interval run and assemble them into a time lapse movie in-camera. The result is a video file, typically 4K, that is ready to share without editing software. The camera applies a frame rate, usually 25 or 30 fps, and encodes the sequence into MP4 or a similar format. For more on choosing the right frame rate, see our video frame rate guide.

The quality of the in-camera assembly depends on how the camera processes each frame. Some cameras apply the same picture profile and color settings as the stills; others apply a separate video processing path. If you shoot raw stills, the in-camera movie is usually made from the JPEG previews, which means the raw files still need to be processed later for the highest quality. That workflow is normal: the in-camera movie is a quick preview, and the raw sequence is the archive. Explore raw format explained to understand the tradeoffs.

If you plan to edit the sequence in software, a camera that saves the individual stills gives you full control over exposure, white balance, and dynamic range in post. Some cameras let you choose to save only the assembled movie, which consumes less card space but discards the individual frames. If you want the flexibility to reframe, grade, or remove a bad frame, choose a camera that saves the stills.

A camera with a built-in time lapse mode is convenient because the settings are tuned for the end result. The exposure settings, the interval, and the frame count are adjusted together so that the playback length comes out as you expect. If you prefer to keep the process manual, an interval mode with separate assemblies gives you more control.

External control and connectivity

Most cameras also support interval shooting from a smartphone app over Wi-Fi or Bluetooth. The app usually provides the same settings as the on-camera menu: interval, frame count, and start delay, plus a live view so you can frame the shot without touching the camera. If a camera relies on the app for start and stop, make sure the app works with the camera firmware version before you buy.

A physical remote or wired release with interval timing can serve the same purpose for cameras without a built-in intervalometer. That option is useful on older DSLRs and on some entry-level models that omit the feature. But a built-in intervalometer with a USB power connection is simpler to set up and less likely to fail in the field.

Cameras with USB-C that support power delivery can run a long time lapse from a power bank, which is convenient for overnight or multi-hour runs. The camera must accept power while the sensor is running, not just when it is off. Models differ in this behavior, so the spec sheet or the manual is the place to check.

What to pick for your workflow

For a first camera dedicated to time lapse, look for one with a wide interval range, a high frame cap, interval priority exposure, and the ability to save both the individual stills and an assembled movie. Cameras with flip screens help you frame a low-angle sequence without lying on the ground. Weather sealing is a plus for outdoor work, though it does not replace a rain cover or a tripod that stays steady in wind. See our tripod mount and stabilization guide for tripod tips.

If your time lapse work focuses on city scenes, crowds, or events, a camera with good autofocus and a reliable interval mode will cover the basics. If you shoot landscapes, stars, or slow nature processes, the interval range and the ability to run long sequences matter more than fast autofocus. In every case, a camera that can run from external power and save raw frames gives you the most flexibility.

The sensor size influences how many frames fit on a card and how much storage you need. A full-frame camera shooting raw produces large files, and a long sequence can fill a card faster than an APS-C or Micro Four Thirds model. For a long nighttime run, a camera with dual card slots can write to two cards for redundancy, which matters if you are away from your computer for days. Review our memory card guide to choose the right storage.

If you expect to shoot video as well as time lapse, the video features of the camera matter. A camera with 4K video, high bit rate, and log or flat profiles can produce a time lapse movie and regular video with a consistent look. The in-camera time lapse movie is a bonus; the stills are the raw material that gives you creative freedom in post. Consider a 4K mirrorless camera if video quality is a priority.

What to pick for your use

Questions

Do all cameras have a built-in intervalometer?

No. Many recent mirrorless and DSLR cameras include interval shooting, but entry-level models sometimes omit it. An external intervalometer or a smartphone app can add the feature to a camera that lacks it.

How long can an interval time lapse run?

The practical limit is set by battery life, card space, and the camera's maximum frame count. With an external power source and enough storage, a run can continue for many hours or overnight.

What is the best frame rate for a time lapse video?

Playback at 25 or 30 frames per second gives a smooth result. For slower motion, 24 fps is common. The frame rate is applied when the stills are assembled into a video.

Should I shoot raw or JPEG for time lapse?

Raw gives you the most flexibility for exposure and color grading in post, but it produces larger files. JPEG is smaller and easier to assemble, but leaves less room to fix exposure or white balance later.

What causes flicker in time lapse videos?

Flicker usually comes from small exposure differences between frames, often caused by the aperture stepping or by auto exposure adjusting brightness. Interval priority exposure, manual mode, and anti-flicker settings reduce it.