Sony A6400 Review: Fast AF, 4K Video, No IBIS

Originally published in May 2021. Updated in September 2026.

The Sony A6400 remains one of the most recognisable APS-C mirrorless cameras in Sony’s E-mount system. Introduced in 2019, it combines a 24.2-megapixel sensor, exceptionally reliable autofocus, 11 fps burst shooting and detailed 4K video in a compact body. It is no longer the newest option in the range, but its core performance still makes it relevant for travel, family photography, action, wildlife and content creation.

This updated Sony A6400 review looks at what the camera still does well, where its age is visible and who should consider buying it today.

Sony A6400 overview

The A6400 uses a 24.2MP APS-C Exmor CMOS sensor and Sony’s BIONZ X processor. Its 425 phase-detection and 425 contrast-detection autofocus points cover a large part of the frame, helping the camera identify and follow subjects quickly. Real-time Tracking and Eye AF remain two of its strongest features, especially when photographing people, pets or unpredictable movement.

It can shoot at up to 11 frames per second with the mechanical shutter or up to 8 fps in silent shooting mode. Video recording reaches UHD 4K at up to 30p, while Full HD can be recorded at up to 120p for slow-motion footage. The camera also provides microphone input, S-Log2, S-Log3 and Hybrid Log-Gamma profiles.

Autofocus and shooting performance

Autofocus is the main reason the A6400 has aged so well. Subject acquisition is fast, Eye AF is dependable and Real-time Tracking reduces the need to move focus points manually. For portraits, children, pets, street photography and casual sports, the focusing system remains highly capable.

The 11 fps maximum burst rate is still competitive for a camera in this class. Buffer depth and memory-card write speed are less impressive than those of newer bodies, but they are adequate for short action sequences. Pairing the camera with a suitably fast card helps it clear the buffer more efficiently; our guide to camera ISO also explains how sensitivity affects image quality and shutter speed in demanding light.

Real-time Eye AF and subject tracking

The A6400 can detect and track human eyes, while animal Eye AF is available for still photography. These features are particularly useful when working with shallow depth of field, where a small focusing error can make the eyes look soft. Sony’s tracking system can also follow a selected subject as it moves across the frame.

The camera does not offer the more advanced subject-recognition categories found in recent Sony bodies, but its original tracking system remains fast and practical.

Image quality

The 24.2MP APS-C sensor produces detailed images with good colour and useful dynamic range. RAW files provide enough flexibility for recovering highlights and opening shadows, provided exposure is reasonably accurate. The native sensitivity range is ISO 100–32,000, expandable to ISO 102,400.

Image quality is strongest at low and moderate ISO settings. Higher sensitivities remain usable when necessary, although fine detail and colour accuracy gradually decline. A bright lens can make a larger practical difference than moving to another APS-C body when shooting indoors or at night. For more control over exposure, see our guide to digital camera settings.

Body, handling and screen

The A6400 has a compact magnesium-alloy body, a 2.36-million-dot electronic viewfinder and a three-inch rear touchscreen. At approximately 403g with battery and memory card, it is light enough for travel and everyday use without feeling insubstantial.

The screen tilts upward by 180 degrees, making self-framing possible for vlogging and photography. However, a microphone mounted directly in the hot shoe can block the screen. A small offset bracket solves the problem, but newer side-hinged screens are more convenient.

Touch functionality is limited compared with modern cameras, and Sony’s older menu system takes time to learn. Custom buttons and the My Menu section help once the camera is configured. Wi-Fi and Bluetooth support wireless image transfer and remote control through Sony’s mobile application.

4K video performance

The A6400 records detailed 4K footage using full-pixel readout without pixel binning. Autofocus remains responsive during recording, and the microphone input makes the camera suitable for interviews, YouTube videos and general content creation. S-Log2, S-Log3 and HLG provide additional flexibility for users who colour-grade their footage.

There are important limitations. The camera has no in-body image stabilisation, so handheld video benefits from an optically stabilised lens, a tripod or a gimbal. Rolling shutter can also distort fast pans or rapidly moving subjects in 4K. The upward-tilting screen is useful until a top-mounted microphone occupies the same space.

https://youtu.be/STrNuKs2TLg

Battery life and storage

The A6400 uses Sony’s compact NP-FW50 battery. It helps keep the body small but does not match the endurance of newer, larger Sony batteries. Carrying a spare is sensible for long photography sessions or video work. USB power can extend recording time when the camera is used in a fixed position.

There is one UHS-I SD card slot, located in the battery compartment. The absence of a second slot is normal for this class, although it means there is no in-camera backup.

Sony A6400 strengths and weaknesses

Who should buy the Sony A6400?

The A6400 makes the most sense for photographers who prioritise autofocus, portability and access to the E-mount lens system. It is a strong fit for travel, family photography, street photography, portraits and entry-level action or wildlife photography.

Video creators can still obtain excellent results, particularly when the camera is used with a tripod, stabilised lens or gimbal. Buyers who regularly shoot handheld video, need a fully articulating screen or want newer subject-recognition modes may be better served by a more recent body.

For an independent hands-on perspective, Shotkit’s Sony A6400 review discusses real-world handling, autofocus, image quality and travel use.

Key specifications

• Sensor: 24.2MP APS-C CMOS
• Lens mount: Sony E
• Autofocus: 425 phase-detection and 425 contrast-detection points
• Continuous shooting: up to 11 fps
• ISO range: 100–32,000, expandable to 102,400
• Video: UHD 4K up to 30p; Full HD up to 120p
• Viewfinder: 2.36-million-dot OLED EVF
• Screen: three-inch tilting touchscreen, 180-degree upward movement
• Stabilisation: no in-body stabilisation
• Storage: single UHS-I SD card slot
• Battery: NP-FW50
• Weight: approximately 403g with battery and memory card

Final verdict

The Sony A6400 is no longer a cutting-edge camera, but it remains a capable APS-C hybrid. Its autofocus, image quality, burst speed and 4K detail still stand up well, while the compact body and extensive E-mount lens selection make it easy to build into a flexible system.

Its age is most obvious in the battery, touchscreen, menu system and lack of in-body stabilisation. Those limitations matter, but they do not erase the camera’s strengths. If the price is competitive and autofocus matters more than the newest interface or stabilisation features, the A6400 remains a sensible purchase.

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