• 35mm 861.6mm2
  • 42.4 megapixels
  • ISO 100 - 32,000
  • APS-C 366.6mm2
  • 24.2 megapixels
  • ISO 100 - 32,000

Buy From

Differences

Sony A7R III advantages over Sony A6400

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Bigger pixels
    ~ 4.51 vs 3.92 microns
    Better low-light and dynamic range (all else equal)
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • Longer stills battery life
    More info 650 vs 410 shots
    Capture more photos
  • Higher max flash sync
    1/250 vs 1/160 sec
    Reduce the effect of ambient light in flash shots
  • More viewfinder magnification
    0.78x vs 0.70x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    42.4 vs 24.2 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Lacks anti-aliasing filter
    No Filter vs Filter
    Enjoy sharper photos
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light

Sony A6400 advantages over Sony A7R III

  • Less expensive
    $998 vs $2798
    Save money for lenses or accessories
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Longer video battery life
    125 vs 100 minutes
    Capture more video
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos
  • Faster JPEG shooting
    11.0 fps vs 9.9 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    11.0 fps vs 9.2 fps
    Faster RAW shooting in burst mode
  • Bigger RAW buffer
    46 vs 30 shots
    Larger buffer for RAW shots (burst mode)

Similarities

Common Strengths

  • Focus peaking
    Both provide
    Your camera will highlight what's in focus
  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • Shoot 4K video
    Both provide
    Make sure you have a fast computer
  • Touchscreen
    Both provide
    Interact with your camera just like your smartphone
  • Tiltable Screen
    Both provide
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • NFC
    Both provide
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Both provide
    Always-on wireless connectivity
  • On-sensor phase detect
    Both provide
    Usually improves live view and video AF performance
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures
  • Slow-motion videos
    Both provide
    Shoot slow-motion videos

Common Weaknesses

  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • Built-in GPS
    Neither provide
    Geotag your photos
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera

User reviews

Buy From

Your purchases support this site

Buy the Sony A7R III

Your purchases support this site

Buy the Sony A6400

Review Excerpt

  • Fantastic image quality; Improved dynamic range over its predecessor; Very good high ISO performance; Much improved real-world AF performance; Class-leading burst rates, even with RAW; Improved 5-axis in-body image stabilization; Better 4K video quality; 1080/120fps video; Dual card slots; Significantly better battery life.

  • Expensive; Menus still confusing; UHS-II support only on one card slot; No optical low-pass filter means greater risk of moire; No built-in flash; Buffer clearing still slow despite UHS-II support.

The Competition

Compared to Sony A7R II

Sony A7R III
Sony A7R II
  • $2798
  • 35mm
  • Touchscreen
  • High resolution composite
  • $1798
  • 35mm
  • Less expensive
  • In-camera panoramas
Sony A6400
Sony A7R II
  • $898
  • APS-C
  • Less expensive
  • Touchscreen
  • $1798
  • 35mm
  • Larger sensor
  • In-Camera Image Stabilization

Compared to Sony A9

Sony A7R III
Sony A9
  • $2798
  • 35mm
  • Less expensive
  • High resolution composite
  • $3998
  • 35mm
  • Bigger pixels
  • Fast startup
Sony A6400
Sony A9
  • $898
  • APS-C
  • Less expensive
  • In-camera panoramas
  • $3998
  • 35mm
  • Larger sensor
  • In-Camera Image Stabilization

Compared to Canon EOS M50

Sony A7R III
Canon EOS M50
  • $2798
  • 35mm
  • Lens selection
  • Larger sensor
  • $629
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Sony A6400
Canon EOS M50
  • $898
  • APS-C
  • Lens selection
  • Larger sensor
  • $629
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Fujifilm X-T100

Sony A7R III
Fujifilm X-T100
  • $2798
  • 35mm
  • Larger sensor
  • Slower slow-motion
  • $499
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Sony A6400
Fujifilm X-T100
  • $898
  • APS-C
  • Slower slow-motion
  • NFC
  • $499
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Nikon Z7

Sony A7R III
Nikon Z7
  • $2798
  • 35mm
  • Less expensive
  • High resolution composite
  • $3397
  • 35mm
  • Top deck display
  • More dots on screen
Sony A6400
Nikon Z7
  • $898
  • APS-C
  • Less expensive
  • In-camera panoramas
  • $3397
  • 35mm
  • Larger sensor
  • In-Camera Image Stabilization
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