You press the shutter the instant the bird leaves its perch, but the frame you get shows only an empty branch. Your reaction time — plus a little shutter lag — cost you the shot. Pre-capture fixes this by quietly photographing the moments before you press the button. Here’s how it works, why it matters, and what every major brand calls it.

What Pre-Capture Actually Does

Pre-capture — called Pro Capture, Pre-Shot ES, Pre-Release Capture, and several other names depending on the brand — continuously records a short, rolling burst of images while you hold the shutter button half-pressed, keeping them only in the camera’s memory buffer. Nothing is written to the card yet. The moment you press the button all the way, the camera saves those buffered frames and keeps shooting forward.

The result is that a fraction of a second of “past” appears in your final burst. If a kingfisher leaves its perch 0.4 seconds before your finger finishes the press, you still get the frame of it leaving — because the camera was already recording the whole time.

How It Works Under the Hood

The mechanism is a circular buffer. When the feature is active, half-pressing the shutter (or a configured button) starts the camera shooting at its selected frame rate — 20, 40, or even 120 frames per second — using the electronic shutter. Frames land in high-speed RAM, not the memory card. Once the buffer window fills (say, one second), each new frame overwrites the oldest one. It’s a rolling queue that always holds the most recent fraction of a second.

On a full press, the camera writes the buffered frames to the card, then keeps capturing after the press until you release the button or hit a frame-count limit. Because the buffer always trails behind you, you effectively gain the buffer length — typically 0.3 to 1.0 seconds — of reaction-time insurance for free.

This is also why pre-capture relies on the electronic shutter: a mechanical shutter has to physically open and close for every exposure and can’t sustain the always-on, high-speed capture the feature demands.

Why Human Reaction Time Is the Real Enemy

Human reaction time to a visual stimulus is roughly 0.2 to 0.3 seconds. Add the delay between deciding to shoot and the exposure actually firing, and a photographer routinely loses 0.3 to 0.5 seconds — longer for a moment that catches you by surprise. At 30 fps, half a second is 15 frames. Pre-capture buys every one of them back.

What Each Brand Calls It

• OM System — Pro Capture: the pioneer. Olympus introduced it on the OM-D E-M1 Mark II in 2016, and the OM-1 Mark II can buffer up to 99 frames before the press at up to 120 fps (ProCap SH1).
• Nikon — Pre-Release Capture: the Z9 gained it in an April 2022 firmware update, making it the first full-frame camera to offer the feature. Buffer of 0.3, 0.5, or 1.0 seconds at up to 120 fps (JPEG only, capped at roughly 11 MP at the top rate).
• Canon — Pre-shooting / Pre-continuous shooting: debuted on the EOS R6 Mark II, now on the R1, R5 II, R7, and R10. About 0.5 seconds (or 20 frames on the R1 and R5 II) at up to 40 fps.
• Sony — Pre-Capture: the last of the big three to adopt it. The a9 III records up to 1 second at 120 fps in full-resolution 24 MP RAW.
• Fujifilm — Pre-Shot ES: on the X-T3 (2018) onward, a roughly 1-second buffer at 10–40 fps.
• Panasonic — Pre-Burst: available on the G9, G9 II, and S5 II.

When to Use It — and Its Limits

Pre-capture shines wherever the decisive moment is unpredictable: birds taking flight, lightning strikes, a baby’s first smile, or a batter’s swing. If the subject’s timing is beyond your control, buffering the past is the single cheapest insurance you can buy.

It has real limits, though. It generally requires the electronic shutter, and on some older sensors that means visible rolling shutter on fast subjects. The fastest settings are often JPEG-only or resolution-capped (Nikon’s 120 fps tops out near 11 MP), and some Canon bodies save the pre-burst as a single file you must extract frames from. It also drains buffer and battery while you half-press. Think of it as a specialized tool, not a default drive mode.

Conclusion

Pre-capture is one of the quietest revolutions in modern cameras — a feature that doesn’t make images sharper or cleaner, but makes the difference between getting the shot and missing it. If your camera has it buried in the drive-mode menu, it’s worth digging out. The next time a moment happens faster than you can react, you’ll already have it on film.

FAQ

Does pre-capture work with RAW? It depends on the model. The Sony a9 III and many OM System and Fujifilm bodies allow RAW; Nikon’s fastest settings are JPEG-only; and some Canon cameras save the pre-burst as a single file you extract frames from.

Does it drain the battery? Yes — it’s continuously shooting while you half-press, so it consumes buffer and battery faster than a camera sitting idle.

Do I need a fast memory card? Helpful but not required for the buffered part, since the write-out happens after the press. A slow card can still stall a long post-press burst, so a fast card is recommended for sustained action.