Eye-detection AF
An autofocus mode that finds and tracks the subject's eye specifically. The defining feature of modern mirrorless portrait and event shooting.
Modern eye-AF uses on-sensor phase-detect AF combined with deep-learning subject recognition. The camera identifies humans (and increasingly animals, birds, vehicles, insects) and locks onto the nearest eye automatically.
How it changed shooting
Pre-eye-AF, photographers used center-point AF and recompose, or carefully placed AF points on the eye. Now the camera does this continuously at 20–40 FPS, freeing the photographer to think about composition.
Variants
- Human eye-AF — universal on mirrorless 2018+.
- Animal eye-AF — Sony A7 III + extensions, now standard.
- Bird eye-AF — narrower training, harder problem, available on flagships (R5, A1, Z9).
- Vehicle / insect — newest, found on R5 Mark II, A1 II, Z8.
In comparisons
Hit rate matters more than feature presence. A camera with a 95% sticky-eye hit rate on running children beats a camera that lists 5 subject modes but only achieves 80%. Look for review-tested hit rate, not marketing.
How to use Eye-detection AF in a real comparison
An autofocus mode that finds and tracks the subject's eye specifically. The defining feature of modern mirrorless portrait and event shooting. In practice, this is most useful as one part of a decision rather than a standalone quality badge. Compare it alongside the workload, room, ecosystem, budget, and ownership constraints that apply to you; the strongest published figure is not automatically the best outcome for every buyer.
What to check next
On vsMars, read together so the value has product-specific context. It is especially relevant in .
Avoid the one-number trap
Manufacturers can describe the same capability under different conditions. Compare like-for-like variants, check the unit and test condition where available, and use a head-to-head page to see whether a measurable difference is material for your own use.
vsMars presents structured catalog values to make trade-offs legible. The linked product and spec pages are the right place to inspect the underlying values before buying.