Face detection finds a face and focuses on it as a whole, while eye detection goes a step further and locks focus on a single eye. For portraits shot at wide apertures, eye detection is usually the better choice because even a small focus miss can leave the eyes soft. Face detection is still a solid fallback when eyes are hidden or tiny.
How Face Detection Works
The camera scans the frame for face shapes and places a focus area on the face. It follows the person as they move, which helps with groups and candid moments. The exact point it chooses on the face is usually near the nose or the middle, so the eyes may sit slightly in front of or behind the focus plane.
How Eye Detection Works
The camera first finds a face, then looks for eyes inside it and places the focus point on one eye, often the nearer one. Many cameras let you choose left or right eye, or switch automatically. This matters most at apertures like f/1.4 to f/2.8, where the depth of field is thin.
Which to Choose
- Choose eye detection for headshots, close portraits and wide-open work.
- Choose face detection for groups, small faces in a wide scene or fast action where eyes are not visible.
- Use face detection when a subject wears dark sunglasses or turns their head away.
- Use eye detection with a single subject who faces the camera at least partly.
Setup Steps
- Set the focus mode to continuous for moving subjects or single for still ones.
- Turn on the subject detection menu and select people.
- Enable eye detection, and choose automatic or a specific eye.
- Pick a wide focus area, or a zone, so the camera can find the face easily.
- Take a trial frame and zoom to check that the nearer eye is sharp.
- If the camera jumps between faces, switch to a smaller area or a single-subject mode.
Quick Comparison
| Trait | Face detection | Eye detection |
|---|---|---|
| Focus target | Whole face | One eye |
| Best aperture range | Any | Wide to medium |
| Groups | Better | Can jump around |
| Close portraits | Good | Better |
FAQ
Do all cameras offer eye detection?
Not all. It is common on newer mirrorless bodies and some recent DSLRs in live view, but check the maker’s specifications for your model.
Which eye should be sharp?
Usually the one closer to the camera. If the face is turned, a sharp near eye reads as natural.
Practical Notes
- Group portraits with a person turned away may need a manual choice of subject.
- Back-button focus lets you control when the camera locks onto an eye.
- Keep the lens clean and the light even, because detection works better when features are clearly visible.
The Short Version
Choose eye detection for close, wide-aperture portraits where the eyes must be sharp. Choose face detection for groups and awkward angles. Many photographers keep both options handy and switch based on the scene.
