You asked

Is the sony a9 iii good in low light?

The Sony a9 III is a full-frame camera, and full frame is the right size for low light. The sensor guide explains that a bigger sensor gathers more light at the same framing and f-number, so images stay cleaner at high ISO, with roughly one stop over APS-C. The a9 III also has in-body stabilisation, which helps when you're shooting handheld in dim places.

I don't have a low-light test score for this body, so I won't put a number on it. The lens matters as much as the camera in the dark. These are good fast picks for the a9 III:

If low light is your top priority above everything else, the Sony a7S III is built for it, though its 12 megapixels is little for stills.

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