How to Lock Exposure and Focus on iPhone Video (AE/AF Lock, Every iOS Version)

Why iPhone Videos Look Unstable (and How to Fix It)

If you've ever watched back an iPhone video and noticed the image suddenly getting brighter, darker, or softening and re-sharpening mid-sentence, that's the iPhone's automatic exposure and autofocus doing their jobs — just not the job you need them to do. The camera is constantly searching for the best settings, which works great for casual photos but destroys professional video quality. Locking AE/AF (Auto Exposure / Auto Focus) is the single most impactful setting change you can make for iPhone video, and it takes exactly one gesture.

How to Activate AE/AF Lock on iPhone

Step-by-Step for Video Mode

1. Open the Camera app on your iPhone.
2. Swipe to Video mode (or Cinematic, if you want depth-of-field effects — lock still works there).
3. Before you press Record, tap and hold on the area of the frame you want to lock — for a talking-head video, tap on your face or wherever your face will be in the frame.
4. Hold until you see the yellow AE/AF LOCK banner appear at the top of the screen and the square yellow focus box pulses.
5. Press Record. Exposure and focus are now locked for the entire recording session.
6. To release the lock at any time, tap anywhere on the screen. A new tap-and-hold will set a new lock point.

What the Lock Actually Does

AE/AF Lock simultaneously freezes two things:

• Auto Focus (AF): The lens stops hunting. It will not re-focus on a background element if something crosses the frame, and it won't blur and re-sharpen as your subject moves slightly.
• Auto Exposure (AE): The sensor brightness stops adapting. If a cloud passes over a window behind you, your face won't suddenly go darker. If you move slightly, the sky behind you won't cause the camera to compensate by darkening your face.

Fine-Tuning Exposure After Locking

AE/AF Lock sets the exposure level at the lock point, but you can still manually adjust brightness after locking. After the AE/AF LOCK banner appears, you'll see a small sun icon next to the focus square. Slide it up to brighten or down to darken — this is the exposure compensation slider. Set it so your face is well-lit without blowing out highlights (watch for pure-white patches on your forehead or cheeks), then record.

Where to Lock for Best Results

Lock on your face, not the background. The iPhone will set exposure to correctly expose your face — if you lock on a bright background, it will underexpose your face to compensate. For a solo talking-head:

• If you're using a stand-in or tripod: lock on something in the approximate position of your face (a piece of white paper at face height works well).
• If you're recording selfie-mode: tap your face in the front camera view before pressing record.
• Avoid locking on a window or any bright light source — this will make your face a silhouette.

Using Third-Party Apps for More Control

The native Camera app's AE/AF Lock is sufficient for most recording needs. But if you want full manual control — setting ISO, shutter speed, and focus distance as separate sliders — consider these apps:

• Blackmagic Camera (free): Professional video controls modeled after a cinema camera. Set ISO, shutter angle, white balance, and focus manually. Best for experienced users.
• Halide Mark III: Manual focus and exposure with precise numeric readouts. Excellent for stationary talking-head setups.
• ProCamera: Manual video controls with a simpler learning curve than Blackmagic Camera.

For most creators, the native AE/AF Lock is the right tool. These apps become valuable when you need consistent exposure across multiple takes and sessions.

The Exposure + Script Workflow

Here's a workflow I recommend: mount your iPhone on a tripod, set your lights, then lock AE/AF on your face position before you sit down to record. Once locked, the exposure is set for your lighting conditions. Then load Telepront's voice-scroll teleprompter on a second device (or your Mac) so your script advances as you speak — your eyes stay on the iPhone lens, your exposure stays locked, and you get consistent, stable footage take after take.

iPhone AE/AF Lock: Common Issues

The lock releases by itself

AE/AF Lock can disengage if you switch apps or if the screen locks. Keep your screen awake (Settings > Display & Brightness > Auto-Lock > Never during recording sessions) and stay in the Camera app.

The banner doesn't appear

Make sure you're holding long enough — a short tap just sets focus temporarily, not the lock. Hold until you see the AE/AF LOCK text. If on an older iOS version, the banner reads "AE/AF LOCK" in a yellow box near the top center of the screen.

The video is still too dark or too bright after locking

Use the exposure compensation slider (the sun icon) after locking. If the problem is extreme, your fundamental lighting setup needs adjustment — no amount of exposure compensation will replace adequate light.