Camera Focus Modes — Explained
Your camera's autofocus system is incredibly smart — but it needs to know what you're photographing to do its job well. A still portrait needs different focus behavior than a running dog. Understanding focus modes is the difference between a sharp subject and a frustrating near-miss.
Single Focus (AF-S / One-Shot)
AF-S (Nikon/Sony) or One-Shot AF (Canon) locks focus when you half-press the shutter. The camera focuses once, then holds that distance. Perfect for still subjects: portraits, landscapes, architecture, products. If the subject moves after focus locks, you'll need to refocus. This is the mode to start with for most beginners.
Continuous Focus (AF-C / AI Servo)
AF-C (Nikon/Sony) or AI Servo (Canon) tracks the subject continuously while you hold the shutter half-pressed. The camera predicts where the subject will be and adjusts focus in real-time. Essential for sports, animals, children, street photography — anything that moves unpredictably. Modern cameras are remarkably good at this, especially with eye-detection AF.
Practice Tip
Test this: Set your camera to AF-S and try to photograph a pet walking toward you. You'll notice the camera focuses where the pet WAS, not where it IS. Now switch to AF-C and try again — the camera tracks the pet as it moves. This is why the right focus mode matters.
Frequently Asked Questions
What about Auto/AF-A focus mode?
AF-A (Auto) switches between AF-S and AF-C automatically. It detects if your subject is moving and adapts. It works reasonably well for casual shooting, but for sports or fast action, manually selecting AF-C gives more reliable results.
When should I use Manual Focus?
Manual focus is useful in specific scenarios: macro photography (where precision is critical), astrophotography (stars are too dim for autofocus), and situations where autofocus hunts back and forth without locking. For everyday shooting, autofocus is faster and more accurate.
Put It Into Practice
Use the wizard to get camera settings for your next shot — based on what you just learned.