• 35mm 861.6mm2
  • 42.4 megapixels
  • ISO 100 - 32,000
  • 4/3 226.2mm2
  • 20.4 megapixels
  • ISO 200 - 25,600

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Differences

Sony A7R III advantages over OM System OM-1

  • Larger sensor
    35mm vs 4/3
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 4.51 vs 3.36 microns
    Better low-light and dynamic range (all else equal)
  • NFC
    Yes vs No
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Yes vs No
    Always-on wireless connectivity
  • More pixels
    42.4 vs 20.4 megapixels
    Higher resolution photos
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

OM System OM-1 advantages over Sony A7R III

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Tilt-swivel screen
    Tilt-swivel vs tilt-only
    Tilt and swivel the screen for maximum shooting flexibility
  • Newer
    3 years vs 7 years old
    Newer cameras often support more advanced features
  • Higher-res screen
    540k vs 360k pixels
    More detail on the screen lets you judge focus and composition
  • Longer exposure
    60 vs 30 sec
    Long exposures for night shots
  • Faster JPEG shooting
    120.0 fps vs 9.9 fps
    Faster JPEG shooting (burst mode)
  • Faster shutter
    1/32000 vs 1/8000 sec
    Shoot wide open in bright light

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
  • 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
  • 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

  • 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
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera

User reviews

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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
  • $2204
  • 35mm
  • Touchscreen
  • High resolution composite
  • $2348
  • 35mm
  • Less expensive
  • In-camera panoramas
OM System OM-1
Sony A7R II
  • $2200
  • 4/3
  • Lens selection
  • Tilt-swivel screen
  • $2348
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Panasonic G95

Sony A7R III
Panasonic G95
  • $2204
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $848
  • 4/3
  • Lens selection
  • Less expensive
OM System OM-1
Panasonic G95
  • $2200
  • 4/3
  • High resolution composite
  • On-sensor phase detect
  • $848
  • 4/3
  • In-camera panoramas
  • Built-in Bluetooth

Compared to Sony A7R IV

Sony A7R III
Sony A7R IV
  • $2204
  • 35mm
  • Less expensive
  • Bigger pixels
  • $3217
  • 35mm
  • Fast startup
  • More pixels
OM System OM-1
Sony A7R IV
  • $2200
  • 4/3
  • Lens selection
  • Tilt-swivel screen
  • $3217
  • 35mm
  • Larger sensor
  • NFC

Compared to Olympus E-M1 Mark III

Sony A7R III
Olympus E-M1 Mark III
  • $2204
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $1699
  • 4/3
  • Lens selection
  • Tilt-swivel screen
OM System OM-1
Olympus E-M1 Mark III
  • $2200
  • 4/3
  • Newer
  • Higher-res screen
  • $1699
  • 4/3

Compared to Nikon Z7 II

Sony A7R III
Nikon Z7 II
  • $2204
  • 35mm
  • High resolution composite
  • NFC
  • $2330
  • 35mm
  • Top deck display
  • Newer
OM System OM-1
Nikon Z7 II
  • $2200
  • 4/3
  • Tilt-swivel screen
  • High resolution composite
  • $2330
  • 35mm
  • Larger sensor
  • Bigger pixels
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