Cameras offer three basic focus modes: single, continuous and manual. Single locks focus once for still subjects, continuous keeps adjusting for moving ones, and manual leaves it to you. Makers use different names, such as One-Shot, AI Servo, AF-S and AF-C, so check your camera’s guide for the labels.
Single Autofocus
You half-press the shutter button, the camera focuses once and holds that distance until you release or take the picture. This suits portraits, landscapes, products and any subject that stays put. Because focus stays locked, you can recompose the frame, but if the subject moves forward or back, your focus will no longer match.
Continuous Autofocus
While you keep the button half-pressed, the camera constantly refocuses, following a subject as it moves toward or away from you. This is the mode for sport, wildlife, children and pets. Many cameras can predict where a subject is heading and adjust accordingly. The camera may let you take a picture even when focus has not yet locked, depending on its settings.
Manual Focus
You turn the focus ring yourself. It is useful in macro work, in dim light, and when autofocus keeps hunting. Aids such as focus peaking and magnified live view make it easier.
Which Mode for Which Job
| Subject | Mode | Reason |
|---|---|---|
| Posed portrait | Single | Subject holds still |
| Landscape | Single or manual | Static scene |
| Running child | Continuous | Distance changes |
| Birds in flight | Continuous | Rapid movement |
| Close-up of an insect | Manual | Thin focus zone |
Habits That Improve Sharpness
- Decide your mode before the moment arrives, not after it.
- Choose a focus area that suits the mode, such as a single point for portraits or a zone for movement.
- Consider back-button focus, which separates focusing from the shutter button.
- Keep the eye as your target for portraits, and focus on the nearer eye.
- Look at the result enlarged on the screen to confirm accuracy.
Some cameras have an automatic mode that switches between single and continuous when it detects movement. It can be handy, but understanding the underlying modes gives you more control.
Matching Mode to Camera Settings
Focus mode works together with shutter speed. A fast subject in continuous mode needs a fast enough shutter to freeze motion, or the picture will look soft even though focus was correct. Light matters too: autofocus works best on contrasty subjects, so in dim scenes, aim at an edge or a bright detail.
FAQ
Why does my camera not take a picture when focus fails?
In single mode, many cameras give priority to focus, so the shutter will not fire until focus is achieved. This can be changed in settings on some models.
Is continuous focus a drain on the battery?
It can use more power because the lens motor is active. A spare battery is useful for long action sessions.
The Short Version
Use single focus for stationary subjects, continuous for moving ones and manual when precision or difficult conditions demand it. Pair the mode with a suitable focus area for better results.
