Modern cameras have multiple autofocus modes. Here is which ones work best for portrait photography and when to switch between them.
Modern cameras offer several autofocus modes designed for different shooting situations. Understanding which to use — and when to switch — makes a meaningful difference in your keeper rate for portrait work.
Called AF-S on Nikon and Sony cameras, One-Shot on Canon, this mode focuses when you half-press the shutter button and locks focus until you lift your finger or fully press to capture. Once locked, the camera does not refocus unless you release and half-press again.
Best for: posed portraits, headshots, any situation where your subject is still. Single-shot AF gives you a definitive confirmation that focus has been acquired before committing to the exposure.
Called AF-C on Nikon and Sony cameras, AI Servo on Canon, this mode continuously tracks a subject as long as you hold the shutter half-pressed. The camera predicts subject movement and adjusts focus to stay locked on the subject.
Best for: subjects in motion — children running, subjects walking toward camera, any dynamic portrait situation where the subject is not stationary. The tradeoff is that focus is never fully "locked" in the same way as single-shot mode.
Available on most modern mirrorless cameras, Eye AF detects and tracks the nearest human eye in the frame. When it works, it is genuinely transformative for portrait photography — the camera handles the hardest part of the job automatically.
Use Eye AF whenever it is available. On Sony, Canon R-series, and Nikon Z-series cameras, it is reliable enough for professional work. Enable it and let it run rather than trying to manage focus points manually.
Beyond the AF mode, cameras offer multiple AF area modes that control how much of the frame the camera uses to find focus:
Many cameras offer both Eye AF and face detection as separate modes. Eye AF locks onto the nearest eye in the frame — more precise for individual portraits where the eye should be the sharpest element. Face detection locks onto the entire face — more reliable in group situations where multiple faces are present. For individual portrait work, use Eye AF. For groups or family sessions, face detection is often more consistent.
Back-button focus separates the autofocus activation from the shutter button. Instead of focusing when you half-press the shutter, you assign focus to a dedicated button on the back of the camera (typically the AF-ON button). The shutter button only triggers the exposure.
This is an advanced technique that gives you more granular control. You can lock focus with the back button and then fire multiple exposures without refocusing. You can also instantly switch between locking focus (press and release the back button) and continuous tracking (hold the back button) depending on whether the subject is moving.
Many professional portrait photographers use back-button focus. It takes a few sessions to retrain the habit but most photographers who make the switch prefer it.
If you're just starting out: set your camera to Single AF, select a single center AF point, half-press to focus on your subject's eye, then recompose and shoot. This is slower than Eye AF but teaches you the fundamentals of where focus should land and why. Graduate to Eye AF once you understand what the camera is trying to do.
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