Sony Alpha a6400 Mirrorless Camera - Fast AF and 4K Video

In this review the Sony Alpha a6400 proves itself as a compact, feature-rich mirrorless camera aimed at enthusiasts and creators who need speed and reliable autofocus in a small package. The single biggest reason to buy is its class-leading autofocus system - the a6400 claims the worlds fastest 0.02 sec AF with real-time Eye AF and object tracking, which translates into consistently sharp photos and videos even when subjects move or when zooming during recording. For anyone upgrading from a smartphone or an entry-level DSLR, it balances image quality, autofocus performance, and portability.

Key Features

• 0.02 sec AF speed: The very fast autofocus and real-time AF keep moving subjects sharp for stills and video without constant manual adjustments.
• Wide AF coverage: With 425 phase and 425 contrast detection points covering over 84% of the sensor, subject tracking is comprehensive across the frame.
• 24.2MP Exmor sensor: The APS-C Exmor CMOS sensor delivers detailed 24.2MP raw images with natural color rendition and good low-light capability.
• 11 fps continuous shooting: Fast burst shooting captures decisive moments and works well for casual action or wildlife when paired with the kit lens.
• 4K video and movie functions: Multiple movie functions, plus time lapse and slow/quick motion options, allow creative recording without heavy post processing.
• Tiltable LCD screen: The flip screen is customizable for vlogging, stills composition, and monitoring when recording.

Who It's For

The a6400 is best for enthusiast photographers and content creators who want a compact system with professional-level autofocus. Beginners who plan to grow into interchangeable lenses will find the camera approachable thanks to clear controls, reliable AF, and an included 18-135mm kit lens that covers wide to moderate telephoto needs.

Serious studio photographers or professionals who require full-frame depth of field or the absolute highest dynamic range may prefer a larger sensor system. Also, those needing extremely long recording durations without the 30-minute limitation noted by some users should check video workflow requirements before purchasing.

Pros & Cons

Pros

• Extremely fast and accurate autofocus with real-time Eye AF and object tracking for both stills and video.
• Versatile 18-135mm kit lens gives a useful focal range for everyday shooting and travel.
• Compact mirrorless body with a tiltable LCD that makes vlogging and framing simple.
• 4K recording and built-in movie functions reduce the need for extensive post processing.

Cons

• Recording sessions are subject to practical limits around 30 minutes for continuous video in some conditions.
• APS-C sensor size is excellent for many users but lacks the shallow depth and low-light headroom of full-frame bodies.

Specifications

Sensor Type	APS-C Exmor CMOS (23.5 x 15.6 mm)
Resolution	24.2MP
Autofocus	0.02 sec AF, real-time Eye AF, 425 phase + 425 contrast detection points
Continuous Shooting	Up to 11 fps
Video	4K recording, time lapse and slow/quick motion functions
Screen	Tiltable LCD flip screen for vlogging and composing
In the Box	Rechargeable battery NP-FW50, AC adaptor, shoulder strap, body cap, accessory shoe cap, eyepiece cup, micro USB cable

Our Verdict

The Sony Alpha a6400 is a smart choice for hobbyists and creators who want a compact camera with class-leading autofocus and solid 4K video features. Its balance of speed, comprehensive AF coverage, and an all-purpose 18-135mm kit lens delivers strong value, making it a dependable step up from smartphone photography or basic DSLRs.

Frequently Asked Questions

Can the a6400 record 4K video continuously?
The a6400 records 4K and supports up to about 30 minutes continuous recording in typical setups, though exact duration varies with settings and heat management.

Is the autofocus reliable for video tracking?
Yes, customers report the real-time AF and object tracking stay locked even while zooming, making it dependable for run-and-gun video.

Does the kit include a battery and cables?
Yes, the box contains a rechargeable NP-FW50 battery, AC adaptor, shoulder strap, body cap, accessory shoe cap, eyepiece cup, and micro USB cable.