Pre-Capture: How to Never Miss the Moment

What pre-capture does

Pre-capture, also called pre-release burst or pre-record, is a mode where the camera continuously writes frames to a temporary buffer while you keep the shutter button half-pressed. When you press fully, the camera saves the frames from the moment just before your press, plus the frames taken after. This means the decisive moment is not lost to reaction time or shutter lag.

The feature is common in action cameras and some mirrorless models, where it helps capture fast, unpredictable motion: a bird taking off, a goal scored, a splash. Without pre-capture, the moment you press the shutter is usually a fraction of a second too late. With it, that fraction is recovered.

The two figures that define the feature are the pre-capture duration (how many seconds of frames before the full press are kept, for example 2 seconds or 5 seconds) and the number of pre-capture frames (how many individual frames at the chosen burst rate are kept). These are set in the camera menu and vary by model.

• Half-press starts continuous recording to a temporary buffer.
• Full press saves the buffered frames plus new ones.
• The saved frames are then written to the memory card.

Buffer depth and card speed are separate

Pre-capture relies on a fast internal buffer, but the buffer is not the memory card. The camera writes pre-capture frames to a temporary high-speed area, then flushes them to the card after the burst ends. Buffer depth (how many frames can be held before the camera slows down) and buffer clear speed (how quickly frames move from buffer to card) are the two specs that decide how many frames you can take in one sequence and how soon you can shoot again.

Action and sports cameras often specify a maximum burst length at a given frame rate, such as a certain number of frames at the top continuous speed. If the buffer fills before the subject settles, the burst rate drops. A deeper buffer holds more frames before that happens.

Card speed matters for clearing the buffer. Faster cards, such as CFexpress Type B used in some Nikon Z cameras, clear the buffer sooner than slower cards. The Memory Cards for Cameras article explains card classes and speeds. Choosing a card that matches or exceeds the camera's write requirement helps keep burst lengths long.

Keep in mind that buffer numbers from manufacturers are often measured with a specific card; a slower card can reduce burst length and increase recovery time.

How pre-capture uses the buffer

When pre-capture is active, the camera continuously overwrites the buffer with new frames, keeping only the most recent ones. At a high frame rate, say 20 frames per second, a 2-second pre-capture keeps the last 40 frames before the full press. At a lower rate, the same duration keeps fewer frames but over a longer real-world span.

This is why the burst rate matters. A higher burst rate means more frames per second to choose from, but also fills the buffer faster after the full press if the burst continues. A lower rate covers more time but with less temporal resolution.

The relationship between burst rate, pre-capture duration, and buffer depth determines how many total frames you can save in one sequence. For example, if the camera can shoot 30 frames per second and the buffer holds 150 frames, you get about 5 seconds of continuous capture before the camera slows down. That includes the pre-capture frames plus the frames after the full press.

The Burst Buffer Depth article focuses on buffer depth for regular bursts; pre-capture adds the extra dimension of time before the press.

What cameras offer pre-capture

Pre-capture appears in several categories, but most commonly in action cameras and in some mirrorless and compact models. Action cameras aimed at sports and adventure often advertise pre-recording as a headline feature because of the unpredictable nature of action shots.

In interchangeable-lens cameras, pre-capture is often found in models positioned for sports and wildlife. Some cameras call it a pre-release burst, others use a different name. A camera family may add the feature through a firmware update, so check the manufacturer's specifications for the specific model and firmware version.

For video, pre-capture works similarly: the camera continuously records to a loop buffer and saves a short clip before you hit the record button. This is common in dashcams and some action cameras.

If pre-capture is not a feature you use daily, consider whether the rest of the camera's specifications suit your main subjects. The guides below can help you compare models by category.

For a compact with a 1-inch sensor, see the Best 1-Inch Cameras in 2026 guide. For action cameras, see Best Action Cameras in 2026. For mirrorless models, see Best Mirrorless Cameras in 2026.

Which specs matter most

When comparing pre-capture capability, four numbers matter most: the maximum pre-capture duration, the continuous shooting rate, the buffer depth (or maximum burst length), and the buffer clear time. These determine how much of the moment you can capture and how quickly you can shoot again.

Duration is the first thing to check. A short 1-second pre-capture may be enough for predictable timing, but a longer 5-second window helps when the action is random. The tradeoff: a longer pre-capture at a high frame rate requires a larger buffer, so many cameras limit the duration at the top burst rate.

Buffer depth is the second figure. It is often listed as the maximum number of RAW or JPEG frames in a burst. Pre-capture frames count against that same buffer, so a camera with a shallow buffer may only capture a second or two before the rate drops.

Clear time is the third figure: how long the camera takes to write the buffered frames to the card. It determines how quickly you can start a second sequence. If you photograph sports, a fast clear time matters more than a slightly higher burst rate.

Buffer clear speed and card choice

Buffer clear time depends on the camera's internal processing and the memory card's write speed. After a pre-capture burst, the camera writes the buffered frames to the card while you may be able to keep shooting at a reduced rate. A faster card reduces the time until the buffer is fully clear.

Nikon's guidance on CFexpress Type B media cards explains that these cards are designed for high write speeds suitable for continuous shooting. A card that meets the camera's recommended specification will clear the buffer faster than an older, slower card. The Camera USB Speeds article covers transfer after the shoot.

Some cameras show a buffer indicator that tells you when the camera is still writing. If you shoot bursts continuously, a camera that writes while shooting (rather than stopping altogether) is more useful. Check the spec sheet: some list a specific continuous shooting speed even while the buffer is clearing.

The Buffer Clear Speed article explains this specific spec in more detail.

Setting up pre-capture on your camera

Pre-capture is usually a mode you turn on in the camera menu, not a default setting. You may need to set three things: the pre-capture duration, the burst rate, and the file type (RAW, JPEG, or both). Longer durations and RAW files use more buffer space, so you may have to reduce one to keep the other.

Some cameras restrict pre-capture to electronic shutter mode, because the sensor is continuously reading out frames. If you prefer mechanical shutter, check whether pre-capture still works. The Mechanical vs Electronic Shutter article explains the difference.

For action, set the burst rate as high as the camera allows. For less predictable moments that require a longer window, choose a longer pre-capture duration. You can often change these on the fly, which helps when the subject changes.

If the camera has a function menu, assign pre-capture to a custom button for quick access. That way, you can turn it on when the moment is near and off when it is not needed, to avoid filling the buffer with frames you do not want. The Custom Camera Buttons and Dials article covers customization.

What to pick for your use

Questions

How long does pre-capture record before the shutter is pressed?

It depends on the camera. Common pre-capture durations range from 1 to 5 seconds, and some cameras let you choose. Longer durations use more buffer space, so they are often limited at the highest burst rates.

Does pre-capture work with RAW files?

Some cameras support RAW pre-capture, but RAW files are larger, so the buffer fills faster. If the camera only supports JPEG pre-capture, you lose the flexibility of RAW editing. Check the spec sheet for the file types supported in pre-capture mode.

Does pre-capture use the mechanical shutter?

Most pre-capture systems use the electronic shutter, because the sensor must read out frames continuously before the press. Some cameras limit pre-capture to electronic shutter mode only.

What is the difference between pre-capture and burst mode?

Burst mode starts recording frames only after you fully press the shutter. Pre-capture starts recording half a press earlier and saves frames from before the full press. Burst mode still works for subjects you can time; pre-capture adds the buffer of time before the press.

Does a faster memory card make pre-capture longer?

A faster card can shorten the time to clear the buffer after a burst, which lets you start another burst sooner. It does not extend the pre-capture duration itself, because that is set by the camera's internal buffer size.

Why does my camera stop pre-capture after a few seconds?

The pre-capture duration and the buffer depth are limited. At a high burst rate, the buffer fills quickly. The camera either stops capturing or reduces the frame rate until the buffer clears to the card.