To lock focus and exposure on most phones, press and hold your finger on the subject until a label such as AE/AF lock appears. The camera then keeps that focus distance and brightness while you move the phone to recompose. Tap elsewhere on the screen to release it.
Why Lock Them at All
Normally the camera keeps adjusting. If you point at a bright window, the whole picture darkens. If someone walks through the frame, focus jumps. Locking removes these surprises so the settings you chose stay in place.
The Basic Method
- Open the camera in photo or video mode.
- Point at the part of the scene that matters, such as a face or a product.
- Press and hold on that spot for about a second or two.
- Wait for the box or ring to pulse and for the lock label to show.
- Drag the small sun icon up or down to make the picture brighter or darker.
- Reframe and take the picture.
Phone makers use different wording and icons, so look at the maker’s guide if your screen shows something unfamiliar.
Where Locking Helps Most
- Video clips. A locked exposure stops brightness from pumping up and down as you pan.
- Close-ups. Locking focus on a flower lets you shift the framing without the lens hunting.
- Stitched panoramas. Even brightness across the sweep gives a cleaner join.
- Backlit people. Lock on the face so the bright background does not darken them.
Mistakes to Avoid
| Mistake | Result | Fix |
|---|---|---|
| Moving closer after locking | Subject goes soft | Release and lock again at the new distance |
| Locking on a bright spot | Rest of frame too dark | Lock on a middle tone instead |
| Forgetting the lock is on | Next scene looks wrong | Tap the screen to release |
| Tapping too briefly | No lock, only a focus tap | Hold until the label appears |
For video, try a short practice run. Lock on a person standing in shade, then pan slowly toward a bright window. With the lock on, the person stays steady and the window may glow; with it off, the whole clip will dim as you pan. Seeing the difference once makes the habit stick.
When the light changes a lot, such as walking from indoors to outdoors, release the lock and set it again. A lock that suited the first place will give wrong brightness in the second.
FAQ
Does the lock stay if I close the app?
No. It resets when you leave the camera or switch modes, so set it again each time.
Can I lock exposure but keep focus live?
On some phones you can by adjusting the exposure slider only. Others tie the two together. Check how your own phone behaves with a quick test.
The Short Version
Press and hold on the subject until the lock label appears, adjust brightness with the slider, then reframe. Release the lock when the scene or distance changes.