Sony's a6400 is a compact 24MP mirrorless interchangeable lens camera with an APS-C sensor that will serve plenty of photographers from family documentarians to pro shooters looking for a lightweight second body. The big news is that it has a new processor based on that used in Sony's sports-shooting flagship a9 which enables 'Real-Time Tracking' autofocus, which is one of the most effective autofocus implementations we've yet seen. It's also among the easiest to use, once you've gotten it set up.

Key specifications:

• 24MP APS-C sensor
• 425-pt phase detection AF system with Real-Time Tracking
• Tilting screen, 180° up, 90° down
• 2.36M-dot electronic viewfinder
• New Bionz X processor
• ISO range from 100-32000
• 11fps burst shooting (8fps with silent shutter)
• Interval shooting option added
• 4K/30p video capture
• Mic input, no headphone output
• 410 shots per battery charge (per CIPA)
• Wi-Fi with NFC and Bluetooth

The Sony a6400 officially replaces the older a6300: it uses the same sensor but comes with some subtle enhancements aside from the impressive autofocus capabilities. It arrives in an increasingly crowded field, though, with cameras like the X-T30 from Fujifilm and the EOS M50 from Canon being similarly priced and with similar sized sensors. Do the enhancements make the a6400 the standout in this crowd? Find out its strengths - and weaknesses - in the pages to follow.

The a6400 is available now for $899 (€1049) body-only, $999 (€1149) with a 16-50mm F3.5-5.6 Power Zoom kit lens and $1299 (€1449) with an 18-135mm F3.5-5.6 zoom.

It's hard to overstate just how good the autofocus system is on the Sony a6400. It's got one of the best implementations out there: not just in its price range, but on the market, period. Once you set the system up, you can pretty much leave it alone for almost any type of photography, whether you're photographing people, landscapes, sports, you name it.

And Sony didn't stop at autofocus; relative to its predecessor, the a6400 sports an updated menu system, a touchscreen that tilts all the way up for the all-important selfie, reduced risk of overheating while shooting 4K video, and more. But as we stated in our first impressions, at least as much of the story about the a6400 is about what Sony hasn't changed, and really should have.

source: https://www.dpreview.com/reviews/sony-a6400-review