How to use AE/AF Lock on iPhone for steadier photo settings

What you are holding steady

AE refers to automatic exposure and AF to autofocus. Apple documents the touchscreen lock as a way to hold focus and exposure settings for subsequent photographs. It gives you a repeatable starting point when you take several pictures of the same setup.

Think of a seated person beside a window. You might want to compare a relaxed expression with a smile without also changing the camera’s selected focus area. That is a useful situation for a lock. A person walking toward the phone presents a different task because their distance keeps changing.

Set the lock, then inspect a saved picture

1. Compose first. Decide which face or object is important and keep the phone at the distance you intend to use.
2. Touch and hold that area until the AE/AF Lock indicator appears. Use the nearby brightness control if the preview needs adjustment.
3. Take one picture before starting the full sequence. Enlarge the important detail in Photos and check bright areas as well as the overall appearance.
4. Keep the setup similar for the next frames. If you change seats, move closer, or turn toward a different light, release the lock and establish it again.

Try a three-shot exercise at a table

Place a mug with lettering beside a window and frame it against the room. Make the lettering your reference detail. Photograph it once with your chosen lock, then make a second frame with a small composition change while keeping the camera-to-mug distance similar.

For the third frame, move closer and set focus again before photographing. Compare the lettering across the three saved files. The purpose is to learn when your setup needs refreshing, not to prove that locking is always better than automatic operation.

Use a stationary object for this practice so facial movement does not complicate the comparison. Once the gesture feels familiar, repeat it with a willing seated subject and review the eyes instead of the mug. These are suggested exercises, not reported device tests.

When the lock becomes the problem

A locked setting can remain inappropriate after the scene changes. If a face becomes soft while the background looks clear, check whether the person or camera moved before reaching for an editing tool. If a cloud passes or someone turns away from the window, reconsider the brightness setting too.

Locking also does not remove camera shake or subject motion during an exposure. For a night portrait, keep the phone supported and the subject comfortably still; use the separate night-photo guide if motion is the main issue. Do not mistake an AE/AF indicator for a guarantee that the photograph will be sharp.

Distinguish the touchscreen lock from other controls

Apple also documents an Exposure control and a Preserve Settings option for retaining an exposure adjustment. That preference is not a promise to preserve focus on a person after you reopen Camera.

On supported iPhones, Camera Control has its own Lock Focus and Exposure setting. With it enabled, a light press and hold maintains the lock; releasing the control ends it. This differs from leaving a touchscreen lock active. Follow the instructions for the control you actually use, and check the visible indicator rather than assuming both gestures behave alike.