Anti-Flicker Shooting: Avoid Light Banding in Photos

What anti-flicker shooting does

Anti-flicker shooting is a feature built into many modern mirrorless cameras and DSLR cameras that prevents a specific type of image artifact called light banding. Banding shows up as uneven horizontal stripes of brightness across a photo, and it appears when your camera's shutter speed is faster than the cycle of the artificial lights illuminating the scene.

The feature works by synchronizing the shutter with the AC power cycle of the light source. Instead of opening the shutter at a random moment, the camera waits for the point in the cycle where the light output is highest and most stable. Each frame in a burst is then exposed at the same point in the cycle, which keeps brightness consistent across every shot.

How the camera detects AC power cycles

When you enable anti-flicker, the camera uses its imaging sensor to check the light before firing. The sensor captures a quick reading of the scene, and the camera's processor analyzes how the brightness rises and falls over time. From that pattern, the processor determines the frequency of the AC power driving the lights. The camera then commands the shutter to release at the point in the cycle where the light is at its most stable.

In continuous shooting, the camera rechecks the light pattern between frames and keeps every exposure aligned with the same phase of the cycle. This matters for sports, event and wildlife photography, where fast burst rates and quick shutter speeds make banding more likely.

When artificial lights flicker

Fluorescent tubes and many LED fixtures operate on alternating current, which means the voltage that feeds them rises and falls at a steady rate. The light output follows that voltage pattern, brightening and dimming many times each second. The human eye and brain smooth out this rapid flicker, so most people never perceive it, but a camera sensor with a fast shutter speed can easily record the dim portion of the cycle.

When your shutter speed is shorter than one full AC cycle, the sensor may expose different parts of the frame to different brightness levels. The top of the frame may catch the bright part of the cycle while the bottom catches the dim part, creating a telltale horizontal band. This is why banding is so common in gyms, arenas, conference rooms and hallways lit by overhead fluorescent or LED fixtures.

When to enable anti-flicker

Turn anti-flicker on whenever you shoot under artificial lighting powered by AC. That includes fluorescent office lights, LED arena panels, street lights at night and certain studio fixtures. If you see horizontal bands of uneven brightness in your photos, or if frames in a burst vary in exposure, the anti-flicker setting is worth enabling.

Many cameras offer three options for the anti-flicker setting: off, on, or auto. In auto mode, the camera continuously samples the light and applies anti-flicker timing only when it detects a flicker source. Auto is a practical choice for photographers who move between outdoor and indoor venues throughout the day, since it avoids the slight shutter delay that anti-flicker can add when no flicker is present.

Anti-flicker is also available on many cameras for video recording, where it keeps exposure consistent across recorded frames. Without it, frame brightness may vary as the electronic shutter rolls through different parts of the AC cycle. Cameras without anti-flicker can still reduce banding in video by selecting a shutter speed that covers a full light cycle, a standard practice among event videographers. If you shoot both stills and moving images, check that the video cameras you are considering support anti-flicker in both video frame rates and still modes.

Limits and alternatives

Anti-flicker has limits. Very old fluorescent fixtures and poorly made LED drivers can produce irregular flicker that no camera can fully match. In those situations, slowing the shutter speed to cover a full cycle of the light, or several full cycles, is the most reliable fix. Using the camera's electronic shutter instead of the mechanical one can also change how banding appears, though it may introduce rolling shutter artifacts of its own.

Anti-flicker can also add a short delay before the shutter fires, because the camera waits for the correct point in the light cycle. The delay is usually brief, but it can matter in action photography where timing is critical. A camera with a fast sensor readout and a high burst rate will handle this more gracefully than a slower model, so if you shoot sports under artificial lights, check the combination of anti-flicker and burst speed before you buy.

What to pick for your use

Questions

What causes banding in photos taken under artificial light?

Banding is caused by AC-powered lights that flicker faster than the eye can see. When the camera's shutter speed is shorter than one full light cycle, the sensor may capture part of the frame during a dim period, producing horizontal stripes of uneven brightness.

Why can't I see the flicker with my own eyes?

The human visual system processes light quickly enough that the rapid dimming and brightening of AC-powered lights becomes imperceptible. A camera sensor samples light differently and can record a moment within the cycle where the light output is low.

Does anti-flicker work with all artificial lights?

It works with lights that follow a regular AC power cycle, such as fluorescent tubes and most LED fixtures. Lights with irregular output, such as those on poor quality dimmers or with damaged drivers, may not be synchronized correctly by the camera.

Should anti-flicker be left on all the time?

If your camera has an auto setting, leaving it in auto is a good choice because the camera only applies anti-flicker timing when it detects a flicker source. If your camera only offers on or off, consider turning it on for indoor work and off for outdoor daylight shooting to avoid any shutter delay.

Does anti-flicker affect burst shooting speed?

It can, because the camera may wait briefly for the right point in the light cycle before each frame. Some cameras maintain the full burst rate while applying anti-flicker, but the delay is usually short and rarely affects the outcome for most shooters.

Can anti-flicker reduce banding in video?

Yes. Many cameras apply anti-flicker timing in video mode to keep frame brightness consistent. Alternatively, you can set a shutter speed that matches the full light cycle, which is common practice for documentary and event video work.