• 35mm 847.3mm2
  • 24.2 megapixels
  • ISO 100 - 51,200
  • APS-C 361.2mm2
  • 25.7 megapixels
  • ISO 100 - 1,600,000

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Differences

Sony A7 III advantages over Pentax K-3 III

  • Less expensive
    $1998 vs $2344
    Save money for lenses or accessories
  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 5.93 vs 3.76 microns
    Better low-light and dynamic range (all else equal)
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Bigger JPEG buffer
    163 vs 30 shots
    Take more JPEG shots before waiting (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

Pentax K-3 III advantages over Sony A7 III

  • 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
  • Newer
    4 years vs 6 years old
    Newer cameras often support more advanced features
  • Higher-res screen
    540k vs 307k pixels
    More detail on the screen lets you judge focus and composition
  • More viewfinder magnification
    1.05x vs 0.78x
    Get a bigger view of the scene through the eye-level viewfinder
  • Optional anti-aliasing filter
    Optional vs Fixed
    Lets you choose sharper photos or reduced moiré
  • Faster JPEG shooting
    12.0 fps vs 9.9 fps
    Faster JPEG shooting (burst mode)
  • Higher extended ISO
    1600000 vs 204800 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

  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Built-in GPS
    Neither provide
    Geotag your photos
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash

User reviews

Buy From

Your purchases support this site

Buy the Pentax K-3 III

Review Excerpt

  • New 24MP sensor offers excellent image quality; Outstanding high ISO performance and dynamic range; Improved JPEG colors; Improved build quality; Fast autofocus; Excellent 4K video; Very good battery life.

  • Buffer clearing can be slow even with fast UHS-II cards; UHS-II support only on one card slot; No losslessly compressed RAW option; Dedicated battery charger not included; Menus are still confusing; No built-in flash.

The Competition

Compared to Sony A7 II

Sony A7 III
Sony A7 II
  • $1865
  • 35mm
  • Shoot 4K video
  • Touchscreen
  • $1148
  • 35mm
  • Less expensive
  • In-camera panoramas
Pentax K-3 III
Sony A7 II
  • $1847
  • APS-C
  • Lens selection
  • Shoot 4K video
  • $1148
  • 35mm
  • Less expensive
  • Larger sensor

Compared to Pentax KP

Sony A7 III
Pentax KP
  • $1865
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $999
  • APS-C
  • Lens selection
  • Less expensive
Pentax K-3 III
Pentax KP
  • $1847
  • APS-C
  • Shoot 4K video
  • Touchscreen
  • $999
  • APS-C
  • Less expensive
  • Tiltable Screen

Compared to Nikon Z6

Sony A7 III
Nikon Z6
  • $1865
  • 35mm
  • NFC
  • Higher effective ISO
  • $1396
  • 35mm
  • Top deck display
  • More dots on screen
Pentax K-3 III
Nikon Z6
  • $1847
  • APS-C
  • High resolution composite
  • Longer stills battery life
  • $1396
  • 35mm
  • Less expensive
  • Larger sensor

Compared to Canon 90D

Sony A7 III
Canon 90D
  • $1865
  • 35mm
  • Focus peaking
  • Larger sensor
  • $1199
  • APS-C
  • Lens selection
  • Less expensive
Pentax K-3 III
Canon 90D
  • $1847
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1199
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Nikon Z6 II

Sony A7 III
Nikon Z6 II
  • $1865
  • 35mm
  • NFC
  • Longer video battery life
  • $1797
  • 35mm
  • Top deck display
  • Newer
Pentax K-3 III
Nikon Z6 II
  • $1847
  • APS-C
  • High resolution composite
  • Optional anti-aliasing filter
  • $1797
  • 35mm
  • Larger sensor
  • Bigger pixels
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