The Sony α6400 is a compact APS-C mirrorless camera. Thanks to its impressive image quality, it takes detailed, sharp images that are mostly free of visible noise, and its effective autofocus system helps keep your shot in focus as your subjects move. It also delivers impressive video recording quality in both 4k and FHD. Unfortunately, it can struggle to smooth out camera shake if you're recording in 4k, so it's not ideal for filming while walking or running.
The Sony a6400 is great for travel photography. It has impressive image quality, so your pictures are sharp and free of visual noise. It's equipped with an excellent autofocus system that can track subjects without issue and its minimum shutter speed is suitable for long-exposure shots. This camera is relatively lightweight, very well-built, and comfortable to use, even for people with fairly large hands. It should also have enough battery life for long shooting sessions.
The Sony a6400 is great for landscape photography. It feels sturdy and is rated as being weather-sealed, though that this isn't something we currently test for. It's relatively lightweight, comfortable to use, and has a touchscreen that's bright enough to be read even under direct sunlight, though you can only use the screen to set timers or change focus points. While the image quality is impressive overall, its kit lens does exhibit noticeable light falloff, which can make the corners of your photo noticeably darker than its center.
The Sony a6400 is good for sports and wildlife photography. Image quality is impressive and it has a responsive and fairly reliable autofocus system that can help you maintain focus on fast-moving subjects. Its maximum shutter speed should help you take clear pictures of fast-moving subjects. Unfortunately, it takes a long time to clear its buffer, so you need to keep continuous shooting bursts short.
The Sony a6400 is good for vlogging. Its flip-out screen can be flipped up to be used as a selfie screen, which is nice. Whether you're recording in FHD or 4k, video recording quality is impressive, so your videos are clear and detailed. However, it does a poor job of smoothing out camera shake in 4k if you're walking or running while recording, though it performs decently in this regard while filming in FHD.
The Sony a6400 is a great option for studio video. Recording quality is impressive in both 4k and FHD, and its autofocus system does an excellent job of tracking faces and inanimate objects. It has a decently wide selection of inputs that let you use microphones and other recording accessories, though its lack of a headphone jack is a little disappointing. It doesn't have a recording time limit, which is good if you frequently record longer videos.
The Sony a6400 isn't designed for action video. When recording in 4k, it supports few frame rate options, and you can't film slow-motion videos. Also, it does a terrible job of smoothing out camera shake if you're running or walking while recording. That said, it's sturdy, relatively compact, and rated as being weather-sealed, though we don't currently test for that.
Update 04/29/2021: Corrected input error in calling the 'Startup Guide' a 'User Guide'.
Update 04/28/2021: The camera's battery life in video was retested. The score for this box has been adjusted.
Update 06/28/2021: We retested this camera's object tracking autofocus performance, reuploaded the object tracking slideshow for reference, and updated the score accordingly. Note that the score is an average of three test runs, and performance can vary across different runs.
There's only one color variant of the Sony a6400: 'Black', and you can see its label here. We tested it with the Sony E 16-50mm 3.5-5.6/PZ OSS lens.
Other lenses are available for purchase with the Sony α6400, including the Sony E 18-135mm f/3.5-5.6 OSS lens, but we haven't evaluated its performance when configured differently. It can also be purchased without a lens at all.
If you come across a different variant of this camera, let us know in the discussions so we can update our review.