AF or MF — which to choose?

**AF** wins in 90% of cases: it's fast, accurate, and modern Eye-AF beats the human eye on reactivity. **MF** keeps its place on a tripod (macro, landscape, astro), in very low light where AF hunts, and in video for smooth, controlled transitions. Learn both, but don't dismiss AF on principle.

Should you always target the closest eye?

At wide apertures, *yes*. Below f/2.8, the sharp zone is so thin that one eye out of two is enough to deliver a blurry, unsettling portrait. If the subject is in profile or both eyes sit on the same plane, it doesn't matter. The moment the head turns, target the iris closest to the sensor.

And for Reels or vertical video?

Engage **continuous tracking** (AF-C, Servo, or equivalent) with face detection. In vertical, the subject moves faster across the frame, and AF has to catch up without hunting. Avoid pure auto: lock on the face. If the background is moving, drop aperture to f/2.8–f/4 to forgive micro-focus errors.

Technical Analysis

Focus

Focus decides what's worth seeing. Everything else becomes background.

Photo : Allef Vinicius / Unsplash

Definition

What is focus?

Focus is the optical setting that renders one specific plane in the scene sharp — the focal plane. Anything off that plane slips into blur, more or less quickly depending on depth of field. It's set via autofocus (phase detection, contrast, or hybrid systems) or in manual. Recent bodies offer Eye-AF that tracks the subject's eye continuously — human, animal, sometimes bird. Properly handled, it ranks the gaze and signs the photographer's intent.

Example

In practice

Portrait at f/1.8, window light. You activate Eye-AF and target the eye closest to the sensor — that's the rule, because depth of field is razor-thin at wide apertures. Three modes coexist. Single-point gives total control, ideal for a posed subject. Zone tracks a cluster of points, useful for half-action. Auto lets the camera choose, handy for reportage but risky on tight portraits: it often grabs the nose or an eyebrow. Stick with single-point as long as you can.

Common mistakes

What we see too often

Missed eye. At f/1.4 or f/1.8, AF locks on the nose or the lashes of the second eye. Result: the gaze floats, the image loses its anchor. Engage Eye-AF or place the focus point yourself on the closest iris.

Blind faith in auto. In a complex scene — fences, glass, a crowd — full-auto AF locks on the wrong plane. Switch back to single-point, target a high-contrast detail, reassess. AF is an assistant, not an autopilot.

How Focalis evaluates

How Focalis evaluates focus

Focalis-X maps the sharp zones of your image and compares them to the likely subject position — face, eye, point of interest. If sharpness lands elsewhere, the score drops and the analysis explains exactly where the focal plane should have sat. Analyze a photo →

FAQ

Frequently asked questions

AF or MF — which to choose?
AF wins in 90% of cases: it's fast, accurate, and modern Eye-AF beats the human eye on reactivity. MF keeps its place on a tripod (macro, landscape, astro), in very low light where AF hunts, and in video for smooth, controlled transitions. Learn both, but don't dismiss AF on principle.
Should you always target the closest eye?
At wide apertures, yes. Below f/2.8, the sharp zone is so thin that one eye out of two is enough to deliver a blurry, unsettling portrait. If the subject is in profile or both eyes sit on the same plane, it doesn't matter. The moment the head turns, target the iris closest to the sensor.
And for Reels or vertical video?
Engage continuous tracking (AF-C, Servo, or equivalent) with face detection. In vertical, the subject moves faster across the frame, and AF has to catch up without hunting. Avoid pure auto: lock on the face. If the background is moving, drop aperture to f/2.8–f/4 to forgive micro-focus errors.