Cameras have three main autofocus modes plus manual focus. Single AF (AF-S) focuses once and locks, for subjects that stay still. Continuous AF (AF-C) keeps refocusing for as long as you hold the focus button, for subjects that move. Automatic AF (AF-A) lets the camera switch between the two. Manual focus (MF) turns the autofocus off so you set focus with the lens ring. Separately, the focus area mode tells the camera where in the frame to focus. Choosing the right pair for the subject is one of the simplest ways to stop missing shots.
Autofocus Modes at a Glance
- AF-S: Also called: Single-shot AF, One-Shot. What it does: Focuses once on a half-press, then locks until you let go. Use it for: Landscapes, architecture, posed portraits, still life, products.
- AF-C: Also called: Continuous AF, Servo. What it does: Keeps tracking and refocusing while the button is held, predicting where the subject will be. Use it for: Sports, wildlife, children, pets, events, anything moving.
- AF-A: Also called: Automatic AF, auto AF. What it does: Starts in single AF and switches to continuous if it detects movement. Use it for: Casual shooting where subjects alternate between still and moving.
- MF: Also called: Manual focus. What it does: Autofocus off; you turn the focus ring. Use it for: Macro, astrophotography, hyperfocal landscapes, video, shooting through glass or fences.
Try It Yourself: Camera Simulator
Click AF-S, AF-C, and MF to see how each focus mode behaves. AF-C tracks moving subjects automatically.
Want other scenes to try this on? The full camera simulator has eight, and 21 challenges.
Focus Mode vs. Focus Area Mode
Your camera has two separate autofocus settings that work together, and mixing them up is a common source of confusion:
- Focus mode decides how the camera focuses: lock once (AF-S), keep tracking (AF-C), decide for itself (AF-A), or not at all (MF).
- Focus area mode decides where the camera looks for something to focus on: a single point, a group or zone of points, the whole frame, or a detected face or eye.
You set both independently. A bird in flight might call for continuous AF with a wide area; a posed portrait for single AF with one point on the nearest eye. The names vary from one camera maker to another, but every modern camera offers the same basic choices. How to choose focus points covers the “where” side in more depth.
Single AF (AF-S): Lock Focus Once
Single autofocus locks focus on your subject when you half-press the shutter button (or press the back button if you use back button focus). Once focus is acquired, it stays at that distance until you release the button and press it again.
This mode is designed for stationary or slow-moving subjects. When the camera confirms focus, usually with a beep or a green indicator, you know the subject is sharp. Many cameras in AF-S will not fire until focus is confirmed, which prevents accidental out-of-focus frames. Because focus stays locked while you hold the button, AF-S also makes the classic focus and recompose technique possible.
Best for: landscapes, architecture, still life, posed portraits, product photography, and anything that is not moving toward or away from the camera.
Limitation: if the subject moves after focus locks, the image will be soft. A child who suddenly leans forward or a pet that shifts position can put the subject outside the focused distance in a fraction of a second.
Continuous AF (AF-C): Track a Moving Subject
Continuous autofocus keeps adjusting focus for as long as you hold the shutter button halfway (or the back button). It also predicts where a moving subject will be at the moment the shutter opens, and drives the lens to that distance. A runner approaching you, a car on a track, a dog crossing a field and a bird in flight are all AF-C subjects.
Best for: sports, wildlife, children, pets, street and event photography, and anything that moves. It is also the recommended mode with back button focus, because one setting then gives you both behaviors: press and release to lock focus like AF-S, press and hold to track.
Limitations: AF-C usually fires whether or not focus is perfect, and it does not show a lock confirmation the way AF-S does. Focus and recompose is unreliable unless you use back button focus, because the camera refocuses on whatever is under the point after you move. In very dim light it may hunt more than single AF.
Want to see how continuous focus behaves in detail? Continuous autofocus (AF-C) compares it with single-shot AF and automatic switching, and covers the AF area modes to pair with it.
Automatic AF (AF-A): Let the Camera Decide
Automatic AF watches the subject and chooses for you. If the subject is still, it behaves like single AF. If it starts moving, the camera switches to continuous AF.
That sounds ideal, but the switching can be unpredictable. The camera may be slow to notice that a still subject has started moving, or it may treat your own small movements as subject movement. Many photographers skip AF-A and either leave the camera in AF-C with back button focus, or switch between AF-S and AF-C themselves. AF-A is a reasonable setting for casual shooting, and for situations where subjects alternate between still and moving, such as children at a party.
Manual Focus: When and How
Manual focus disables the autofocus motor, and you turn the focus ring to set the distance yourself. Autofocus is faster and more accurate in most situations, but manual focus is the right tool when autofocus cannot see what you want or cannot hold it steady:
- Macro photography. At close range the depth of field is razor thin and autofocus often hunts back and forth. Many macro photographers set the lens to a fixed distance and rock the camera, or the whole body, slowly forward and back until the right detail snaps sharp.
- Hyperfocal landscapes. To keep everything from a near point to infinity acceptably sharp, you set a precise distance. Autofocus does not know about hyperfocal distance; it simply focuses on whatever is under the point.
- Astrophotography. In darkness autofocus has nothing to lock on. Manual focus with magnified live view on a bright star is the reliable method.
- Shooting through obstacles. If autofocus keeps grabbing a fence, a window or branches, manual focus solves it instantly. Shooting through glass or fences covers this in detail.
- Low contrast and very dim scenes. Fog, plain walls and dark interiors give autofocus little to work with.
- Video. Smooth, deliberate focus pulls are easier to control by hand than with autofocus that might hunt mid-shot.
How to Get Good at Manual Focus
- Turn on focus peaking. Focus peaking outlines in-focus edges in a bright color on the screen or electronic viewfinder, so you can see where the plane of focus falls.
- Magnify the view. Zoom the live view or viewfinder to 5x or 10x on the exact detail that must be sharp, such as an eye or a star, and focus there before returning to the full frame.
- Overshoot, then come back. Turn the ring past the point of sharpness until the detail softens again, then come back slowly and stop where it is crispest. Bracketing the sharp point like this is more reliable than creeping toward it from one side.
- Use the distance scale for speed. On lenses that have one, pre-setting a distance lets you shoot without looking, a method street photographers build a whole technique on.
- Stop down when you can. A smaller aperture gives more depth of field and more room for error.
- Practice on still subjects first. Then move to slow-moving ones, such as people walking toward you, before trying anything fast.
Shooting fast on the street without waiting for autofocus? Zone focusing explains how to pre-focus using the lens distance scale and depth of field marks.
Focus Area Modes
Once you have chosen a focus mode, the focus area mode decides where the camera looks. The names differ between makers, but the main options are the same:
Single-point AF. One focus point that you place yourself. It gives the most control and is the best choice for still subjects and posed portraits, with the point on the nearest eye. The trade-off is that you must move the point if the subject moves in the frame.
Zone or group AF. A cluster of points in an area you choose; the camera focuses on the nearest subject inside it. It is the middle ground between single-point precision and whole-frame coverage, and works well for sports and action when the subject moves within a predictable part of the frame.
Wide or auto-area AF. The camera uses all its points and picks the subject, usually the nearest or most prominent. It needs the least input and gives the least control. It suits fast, unpredictable subjects such as birds against open sky, but can choose the wrong subject in a busy scene.
Tracking AF. You start focus on the subject and the camera moves the active point to follow it across the frame while in AF-C.
Face and eye detection. The camera finds faces and eyes, of people and on many cameras animals too, and keeps focus on the eye even as the subject turns or moves. For portraits and wildlife it handles the most important focus job automatically, and pairs naturally with AF-C.
Photographing people or animals? Eye detection AF explains how it works, when to use it and how to set it up.
Choosing the Right Combination
- Posed portrait: AF-S with single-point on the nearest eye, or AF-C with eye detection.
- Landscape: AF-S with single-point, or manual focus at the hyperfocal distance.
- Sports and action: AF-C with zone or group area. Start with the zone on the subject and keep it there.
- Birds in flight and wildlife: AF-C with wide area, zone or tracking, plus animal eye detection if available. For still wildlife, single-point on the eye.
- Street: AF-C with zone for flexibility, AF-S with single-point for deliberate compositions, or manual zone focusing.
- Children and pets: AF-C with zone or wide area. Their unpredictability favors a larger area.
- Macro: manual focus with peaking and magnification.
- Night sky: manual focus on a bright star in magnified live view.
Back Button Focus
Back button focus moves autofocus off the shutter button to a button on the back of the camera. The shutter button then only takes the picture. With the camera left in AF-C, you hold the back button to track a moving subject, or press and release it to lock focus on a still one and recompose freely. It removes most of the reasons to switch between AF-S and AF-C, which is why many sports, wildlife and wedding photographers use it. Back button focus explains how to set it up.
Focus and Recompose
Focus and recompose means placing the focus point on the subject, locking focus (AF-S or a back button tap), then moving the camera to the final composition before pressing the shutter. It lets you use a central point, often the most sensitive one, while placing the subject off-center.
It works well at moderate distances and smaller apertures. Close up and at wide apertures it can fail: turning the camera changes the distance to the subject slightly, enough to move a shallow plane of focus off an eye. In those situations move the focus point to the subject instead of recomposing. A joystick or touchscreen makes this quick.
Common Focus Mistakes
- Using AF-S for moving subjects. Focus locks at one distance while the subject keeps moving. Switch to AF-C for anything in motion.
- Using wide-area AF in busy scenes. With several subjects at different distances, the camera may pick the wrong one. Narrow the area to single-point or zone.
- Focusing on the nose, ear or shoulder in portraits. The eyes must be sharp. Use eye detection or put a single point on the nearest eye.
- Recomposing at f/1.4 to f/2.8. The small shift moves the plane of focus off the subject. Move the point instead.
- Never changing from the default mode. Thirty seconds spent choosing the mode for the subject raises the hit rate more than any accessory.
- Refusing to go manual. In darkness, through obstacles or at macro distances, autofocus may hunt forever. Switching to manual focus is the right call, not a step backward.
Autofocus hunting or locking on the wrong thing? How to fix common autofocus problems works through hunting, wrong-target locks and focus that is slightly off on every frame.
Try This: The AF-S vs. AF-C Test
Ask someone to walk steadily toward you from about 15 meters away, or photograph cars on a street. Set a fairly wide aperture so depth of field is shallow, and shoot a burst in AF-S, keeping the shutter half-pressed after the first lock. Then shoot the same approach in AF-C. Compare the frames at 100 percent: in AF-S only the first frame or two will be sharp, while AF-C keeps the subject sharp through the burst. Finish by switching to manual focus, pre-focusing on a spot on the ground, and taking one frame as the subject reaches it. Ten minutes, and you will know exactly what each mode does.
Frequently Asked Questions
What is the difference between AF-S and AF-C?
AF-S locks focus once when you press the focus button and holds it until you release and press again. AF-C keeps adjusting focus as long as you hold the button, tracking subject movement. Use AF-S for stationary subjects and AF-C for anything that moves. With back button focus and AF-C, you get both: tap and release to lock, press and hold to track.
Which autofocus mode should I use most of the time?
If your subjects are mostly still, AF-S with a single point gives the most control. If they move, or you are never sure, AF-C is the safer default, especially combined with back button focus. AF-A is fine for casual use, but its switching is less predictable than choosing yourself.
When should I use manual focus instead of autofocus?
Use manual focus when autofocus cannot do the job: in darkness, at macro distances, through glass or fences, on low-contrast subjects, or when you need a precise, repeatable distance such as hyperfocal focusing. It is also preferred for video focus pulls. Turn on focus peaking and magnification to make it accurate.
Should I use eye autofocus all the time?
Use it whenever you photograph people or animals; it is usually more accurate than placing a point by hand. It does not help with landscapes, architecture, macro or anything without eyes, and it can struggle in low light, with sunglasses, or when the face is partly hidden. Keep it as the default for people and switch when the subject changes.
Why are my action photos always blurry?
The most common cause is shooting moving subjects in AF-S, so focus locks and the subject moves out of it before the shutter fires. Switch to AF-C with zone or wide area. Also check that the shutter speed is fast enough to freeze the motion: around 1/500 second for runners and 1/1000 or faster for fast sports and birds.
Is your shutter speed fast enough for the motion? Photographing moving subjects covers freezing action, creative motion blur and panning.
What focus area should I use for wildlife?
For moving wildlife, AF-C with zone or wide area, plus animal eye detection if the camera has it. For birds in flight against sky, wide area or tracking gives the camera the best chance of finding and holding the bird. For still animals, single-point AF placed on the eye is the most precise.