Sony Alpha a6400 Mirrorless Camera: Compact APS-C Interchangeable Lens Digital Camera with Real-Time Eye Auto Focus, 4K Video, Flip Screen & 16-50mm Lens - E Mount Compatible Cameras - ILCE-6400L/B

• Next Gen speed: experience the world’s fastest 0. 02 sec AF with real time AF and object tracking
• Enhanced subject capture: wide 425 Phase/ 425 contrast detection points over 84 percent of the sensor
• Fast & accurate: up to 11Fps continuous shooting at 24.2 MP raw with crisp, clear natural colors
• Multiple movie functions: make time lapse movies or slow/quick motion videos without post processing
• Tiltable LCD screen: customizable for vlogging, still photography or recording a professional film
• In the box: rechargeable battery (NP FW50) AC adaptor (ac uud12), shoulder strap, body cap, accessory shoe cap, eyepiece cup, micro USB cable.Metering Type:1200 zone evaluative metering

Advanced APS-C camera with 24.2 MP Exmor CMOS sensor, the World’s fastest autofocus (AF) speed1 at 0.02 sec., advanced Real-time Eye-AF and Real-time object Tracking AF with Wide 425-phase/425-contrast detection AF points over 84% of sensor, up to 11fps continuous shooting3 with continuous autofocus and auto-exposure, 4K HDR video2, 180-degree tiltable touchscreen LCD and Wi-Fi for easy file transfer and remote control. Available in body-only and body + lens options.

The α6400’s unrivaled 4D FOCUS™ system boasts the world’s fastest autofocus (AF) acquisition time1 that can lock focus on even the fastest moving subject in as little as 0.02 seconds1. It also boasts an incredible 425 phase detection and 425 contrast detection AF points that are densely positioned over 84% of the image area, effectively tracking subjects as they move across the frame. Moreover, the α6400 takes full advantage of its enhanced fast hybrid AF for movies in both HD and 4K2. With the optimized new-generation subject motion prediction algorithm from the α9. Both AF detection accuracy and tracking performance have been boosted.

Advanced “Real-time Eye AF” employs artificial intelligence to detect and process eye data in real time, resulting in improved accuracy, speed and tracking performance of Eye AF. With a half press of the shutter button, the camera can automatically detect the eyes of the subject and activate Eye AF in all autofocus modes and when in either AF-C or AF-A mode, eye capture is continuously maintained. Additionally, the preferred eye (left or right) of your subject can be selected as the focus point. Choices include Auto/Right Eye/Left Eye, and a Switch Right/Left Eye function is assignable to a custom function as well.

The α6400 offers internal 4K (QFHD: 3840 x 2160) recording2 in Super 35mm format with full pixel readout and no pixel binning at 2.4x oversampling4 (6K equivalent) for the ultimate 4K footage with exceptional detail and depth. Additional professional video features include; HDR (HLG), S-Gamut3/S-Log3and 3, plus Gamma Display Assist, the ability to record Full HD at 120 fps for up to 5x slow motion HD video7, both a mic jack and XLR compatibility via the MI shoe, enhanced Zebra functionality, focus peaking, picture profile settings, as well as Time Code / User Bit, clean HDMI output and much more.

The fully tiltable (180-degree), 3” (3.0-type) LCD flip screen with 921k-dots of high-resolution allows for simple and effective selfie-style shooting for both still image and video capture. Utilizing this capability, vloggers will be able to check and monitor composition throughout their entire creative process. The LCD screen is also equipped with touch functionality, with options for Touch Pad, Touch Focus, Touch Shutter and new Touch Tracking which quickly activates “Real-time Tracking” through the touch screen

1 Among interchangeable-lens digital cameras equipped with an APS-C image sensor as of January 2019, based on Sony research, measured using CIPA-compliant guidelines, and internal measurement method with an E 18-135mm F3.5-5.6 OSS lens mounted, Pre-AF off and viewfinder in use.

2 SDHC/SDXC memory card of Class 10 or higher is required for movie recording in XAVC S format. UHS-I (U3) SDHC/SDXC card is required for 100Mbps recording. Movie recording is possible for approximately 29 minutes.

3 High-speed continuous shooting is available at up to approx. 11fps in “Hi+” continuous shooting mode and up to approx. 8fps in “Hi” continuous shooting mode. Maximum fps will depend on camera settings.

4 With "Hi" continuous shooting mode. Sony internal measurement.

I have owned the a6400 for 10 days now since the day it started shipping. I have tested AF, Tracking, low light high ISO performance of this camera. The AF accuracy seems to be fantastic and very accurate in AF-C mode without tracking. If you can nail the focus then the pictures render a 3D pop in them. In tracking mode it is accurate but is not blazing fast (You can still get a high keeper rate more than 80%). I also own an A9 and native lenses as well as adapted lenses. I compare the two cameras and I can honestly say the a6400 even though 1/4th the price of an A9 is 50% close performance wise to an A9. The 2 pictures on the street(bus and car) were me testing the AF tracking and it seems pretty good for the first try within hours I received the camera without much fiddling into the settings. The third one is indoor with ISO 3200 and all of them are Straight out of the camera untouched.
There is no IBIS in this camera but my lenses have OS or IS image stabilization and works very well.
There is an Auto ISO feature which takes 3 pictures in rapid succession and combines them like an HDR image for you. I love this feature and it is awesome in low-light without a flash.
The clear digital zoom is another feature that extends your lens range to double and is handy at times if you want that shot but lack the reach. 

for ex. if you have a lens that can zoom upto 200mm the clear zoom will make it 400 mm if you choose that option in menu settings.