• APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200
  • APS-C 366.6mm2
  • 24.2 megapixels
  • ISO 100 - 32,000

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Differences

Pentax K-S1 advantages over Sony A6400

  • Less expensive
    $500 vs $998
    Save money for lenses or accessories
  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Optional anti-aliasing filter
    Optional vs Fixed
    Lets you choose sharper photos or reduced moiré
  • Faster shutter
    1/6000 vs 1/4000 sec
    Shoot wide open in bright light

Sony A6400 advantages over Pentax K-S1

  • Shoot 4K video
    4K (UHD) vs 1080p
    Make sure you have a fast computer
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Built-in Wi-Fi
    Wi-Fi vs None
    Share your photos wirelessly
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Yes vs No
    Always-on wireless connectivity
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • Newer
    7 months vs 5 years old
    Newer cameras often support more advanced features
  • Lighter weight
    519g vs 765g
    Lighter weight
  • More viewfinder magnification
    0.70x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    24.2 vs 20.1 megapixels
    Higher resolution photos
  • Wider angle kit lens
    24 mm vs 27 mm
    Capture more of the scene with the included lens
  • Faster JPEG shooting
    11.0 fps vs 5.4 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    87 vs 20 shots
    Take more JPEG shots before waiting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Higher extended ISO
    102400 vs 51200 ISO
    Higher extended ISO can give more low-light flexibility

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
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • 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

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
  • Dual card slots
    Neither provide
    Gives you more storage flexibility
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video

User reviews

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Buy the Pentax K-S1

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Buy the Sony A6400

Review Excerpt

The Competition

Compared to Sony A58

Pentax K-S1
Sony A58
  • $500
  • APS-C
  • Lens selection
  • Less expensive
  • $598
  • APS-C
  • In-camera panoramas
  • Tiltable Screen
Sony A6400
Sony A58
  • $898
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $598
  • APS-C
  • Less expensive
  • In-Camera Image Stabilization

Compared to Nikon D5500

Pentax K-S1
Nikon D5500
  • $500
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $461
  • APS-C
  • Less expensive
  • Tilt-swivel screen
Sony A6400
Nikon D5500
  • $898
  • APS-C
  • Focus peaking
  • Shoot 4K video
  • $461
  • APS-C
  • Lens selection
  • Less expensive

Compared to Pentax K-S2

Pentax K-S1
Pentax K-S2
  • $500
  • APS-C
  • Higher-res screen
  • $512
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi
Sony A6400
Pentax K-S2
  • $898
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $512
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Canon EOS M50

Pentax K-S1
Canon EOS M50
  • $500
  • APS-C
  • Lens selection
  • Larger sensor
  • $629
  • APS-C
  • Tilt-swivel screen
  • Shoot 4K video
Sony A6400
Canon EOS M50
  • $898
  • APS-C
  • Lens selection
  • Larger sensor
  • $629
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Sony A6100

Pentax K-S1
Sony A6100
  • $500
  • APS-C
  • Less expensive
  • Lens selection
  • $748
  • APS-C
  • Shoot 4K video
  • Touchscreen
Sony A6400
Sony A6100
  • $898
  • APS-C
  • Higher extended ISO
  • $748
  • APS-C
  • Less expensive
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