Lock Your Exposure Before The Light Moves On You

Auto exposure follows the scene, not your subject

Left to itself, the camera re-meters every time the frame changes. Pan toward a window and the whole shot dims. Let a cloud pass and it brightens. Your subject may not have moved, but the exposure has.

Locking the exposure freezes one reading so brightness stops chasing the light. That single habit fixes more footage than any lens.

Ways to lock it

On a camera, use auto exposure lock or switch fully to manual. On a phone, tap and hold the focus point until the lock indicator appears, then drag the sun icon. The mechanics differ but the goal is the same.

Lock on a face or a midtone, not on the sky. You are choosing the value that matters, then refusing to let the camera second-guess you.

The camera is happy to re-expose your shot a dozen times a minute. You are the only one in the room who knows what the shot is supposed to look like.

When locking pays off

Any time your subject stays put but the frame moves, locking wins. A talking head against a window, an interview as people walk behind, a product shot with a hand entering frame.

If both subject and light change, locking can trap you. In that case leave auto on and learn its habits instead.

Watch the seam

When you finally leave or switch modes, the brightness will jump. Cut around it or make the change mid-move so the transition hides. A sudden exposure shift is more distracting than a slightly wrong one.

Good editors hide the seam. Good shooters plan where it lands.

Key takeaways

• Auto exposure drifts whenever the frame changes.
• Lock on a face or midtone, never on the sky.
• Lock when the subject is steady but the scene moves.
• Leave auto on only when both light and subject keep changing.
• Plan where any exposure jump will land.

Make locking automatic

Set your camera to lock exposure with one button press and practice until your thumb finds it without looking. On a phone, the long press becomes second nature.

Once locking is a reflex, you stop reviewing footage and wondering why half of it flickers.