• 35mm 847.3mm2
  • 12.1 megapixels
  • ISO 80 - 102,400
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Sony A7S III advantages over Pentax K-3 III

  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 8.40 vs 3.76 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Lighter weight
    614g vs 820g
    Lighter weight
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

Pentax K-3 III advantages over Sony A7S III

  • Less expensive
    $2344 vs $3198*
    Save money for lenses or accessories
  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More viewfinder magnification
    1.05x vs 0.90x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    25.7 vs 12.1 megapixels
    Higher resolution photos
  • Higher extended ISO
    1600000 vs 409600 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
  • In-Camera Image Stabilization
    Both provide
    Reduces the effects of camera shake at slower shutter speeds
  • Shoot 4K video
    Both provide
    Make sure you have a fast computer
  • Touchscreen
    Both provide
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Both provide
    Share your photos wirelessly
  • Built-in Bluetooth
    Both provide
    Always-on wireless connectivity
  • 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
  • Dual card slots
    Both provide
    Gives you more storage flexibility
  • Headphone jack
    Both provide
    Monitor audio recording while you shoot video
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Built-in GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash

User reviews

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Your purchases support this site

Buy the Pentax K-3 III

Review Excerpt

The Competition

Compared to Sony A7S II

Sony A7S III
Sony A7S II
  • $3348
  • 35mm
  • Tilt-swivel screen
  • Slower slow-motion
  • $2398
  • 35mm
  • Less expensive
Pentax K-3 III
Sony A7S II
  • $1847
  • APS-C
  • Lens selection
  • Touchscreen
  • $2398
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Pentax KP

Sony A7S III
Pentax KP
  • $3348
  • 35mm
  • Tilt-swivel screen
  • Larger sensor
  • $999
  • APS-C
  • Less expensive
  • Lens selection
Pentax K-3 III
Pentax KP
  • $1847
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $999
  • APS-C
  • Less expensive
  • Tiltable Screen

Compared to Canon 90D

Sony A7S III
Canon 90D
  • $3348
  • 35mm
  • Focus peaking
  • Larger sensor
  • $1099
  • APS-C
  • Less expensive
  • Lens selection
Pentax K-3 III
Canon 90D
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1099
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Sony A9 II

Sony A7S III
Sony A9 II
  • $3348
  • 35mm
  • Less expensive
  • Tilt-swivel screen
  • $4498
  • 35mm
  • On-sensor phase detect
  • More pixels
Pentax K-3 III
Sony A9 II
  • $1847
  • APS-C
  • Lens selection
  • Less expensive
  • $4498
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Canon R6

Sony A7S III
Canon R6
  • $3348
  • 35mm
  • Slower slow-motion
  • Bigger pixels
  • $2149
  • 35mm
  • Less expensive
  • On-sensor phase detect
Pentax K-3 III
Canon R6
  • $1847
  • APS-C
  • High resolution composite
  • Top deck display
  • $2149
  • 35mm
  • Tilt-swivel screen
  • Larger sensor
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