• 35mm 861.6mm2
  • 42.4 megapixels
  • ISO 100 - 25,600
  • APS-C 366.6mm2
  • 24.2 megapixels
  • ISO 100 - 32,000

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Differences

Sony A99 II advantages over Sony A6400

  • Tilt-swivel screen
    Tilt-swivel vs tilt-only
    Tilt and swivel the screen for maximum shooting flexibility
  • 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)
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • 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 A99 II

  • Less expensive
    $998 vs $3198*
    Save money for lenses or accessories
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Newer
    1 month vs 2 years old
    Newer cameras often support more advanced features
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos
  • Bigger JPEG buffer
    99 vs 61 shots
    Take more JPEG shots before waiting (burst mode)
  • Bigger RAW buffer
    46 vs 25 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
  • In-camera panoramas
    Both provide
    Stitches multiple shots into a panoramic photo
  • 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

  • Built-in GPS
    Neither provide
    Geotag your photos

User reviews

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Your purchases support this site

Buy the Sony A6400

Review Excerpt

  • Superb image quality at low, moderate ISOs; Improved high ISO performance; Fast continuous shooting speeds; Very impressive hybrid autofocus; High-quality 4K UHD video; Rugged camera body.

  • Multi-selector joystick can be awkward to use; No EVF live view at fastest burst rate; Buffer clearing is slow with no UHS-II support; 4K UHD video isn't as full-featured as E-mount counterparts.

The Competition

Compared to Canon 5DS

Sony A99 II
Canon 5DS
  • $3198
  • 35mm
  • Focus peaking
  • Tilt-swivel screen
  • $3499
  • 35mm
  • Lens selection
  • Fast startup
Sony A6400
Canon 5DS
  • $898
  • APS-C
  • Focus peaking
  • Less expensive
  • $3499
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Canon 5DS R

Sony A99 II
Canon 5DS R
  • $3198
  • 35mm
  • Focus peaking
  • Less expensive
  • $3699
  • 35mm
  • Lens selection
  • Fast startup
Sony A6400
Canon 5DS R
  • $898
  • APS-C
  • Less expensive
  • Focus peaking
  • $3699
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Nikon D850

Sony A99 II
Nikon D850
  • $3198
  • 35mm
  • Tilt-swivel screen
  • In-Camera Image Stabilization
  • $3097
  • 35mm
  • Lens selection
  • Touchscreen
Sony A6400
Nikon D850
  • $898
  • APS-C
  • Less expensive
  • In-camera panoramas
  • $3097
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Canon EOS M50

Sony A99 II
Canon EOS M50
  • $3198
  • 35mm
  • Lens selection
  • Larger sensor
  • $629
  • APS-C
  • Less expensive
  • Touchscreen
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 A99 II
Fujifilm X-T100
  • $3198
  • 35mm
  • Larger sensor
  • Slower slow-motion
  • $499
  • APS-C
  • Less expensive
  • Touchscreen
Sony A6400
Fujifilm X-T100
  • $898
  • APS-C
  • Slower slow-motion
  • NFC
  • $499
  • APS-C
  • Less expensive
  • Tilt-swivel screen
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