Sony A7 IV Autofocus Performance Under Low Light

The Sony A7 IV stakes its reputation on an autofocus system that promises to keep working when the light gives out. Its 759 phase-detect points cover nearly the whole frame, and the subject-recognition algorithms carry over bird, animal, and human tracking from the flagship line. The question worth asking is whether that spec sheet holds up at the edge of usable light, where contrast collapses and every system begins to hunt.In dim rooms the A7 IV locks onto faces noticeably faster than its predecessor, and it holds that lock through modest subject movement where the older body would drift. Eye detection remains active well below the level where a typical DSLR would fall back to a single point, which changes how confidently you can shoot a candlelit portrait. The real improvement appears in the way the camera recovers, snapping back to an eye within a fraction of a second after a subject turns away and returns.Compare it against rival full frame bodies and the differences sharpen.

A Canon R6 II closes most of the gap at moderate ISO, while Nikon bodies lean on a slight edge in