• 35mm 861.6mm2
  • 42.4 megapixels
  • ISO 100 - 32,000
  • 35mm 858.0mm2
  • 24.6 megapixels
  • ISO 100 - 25,600

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Differences

Sony A7R III advantages over Sigma fp

  • Eye-level viewfinder
    Eye-level vs Rear display only
    You'll be able to frame photos even when the sun is out
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • High resolution composite
    Yes vs No
    Combine multiple shots to form a super hi-res version
  • 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
  • Higher max flash sync
    1/250 vs 1/30 sec
    Reduce the effect of ambient light in flash shots
  • More pixels
    42.4 vs 24.6 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
  • Bigger JPEG buffer
    82 vs 12 shots
    Take more JPEG shots before waiting (burst mode)
  • Bigger RAW buffer
    30 vs 12 shots
    Larger buffer for RAW shots (burst mode)

Sigma fp advantages over Sony A7R III

  • Less expensive
    $1599 vs $1909
    Save money for lenses or accessories
  • Bigger pixels
    ~ 5.98 vs 4.51 microns
    Better low-light and dynamic range (all else equal)
  • Thinner
    45 mm vs 73 mm
    Thinner
  • Lighter weight
    422g vs 657g
    Lighter weight
  • More dots on screen
    2100k vs 1440k dots
    Can mean greater resolution or a brighter screen
  • Faster JPEG shooting
    18.0 fps vs 9.9 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    18.0 fps vs 9.2 fps
    Faster RAW shooting in burst mode

Similarities

Common Strengths

  • Focus peaking
    Both provide
    Your camera will highlight what's in focus
  • 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
  • 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

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

User reviews

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Buy the Sigma fp
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  • Body Only
  • Kit with 45mm f/2.8 lens
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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.

  • Read our Sony A7R III Review

The Competition

Compared to Sony A7R II

Sony A7R III
Sony A7R II
  • $2204
  • 35mm
  • Touchscreen
  • High resolution composite
  • $2348
  • 35mm
  • In-camera panoramas

Compare Sony A7R III vs Sony A7R II

Sigma fp
Sony A7R II
  • $1699
  • 35mm
  • Bigger pixels
  • Touchscreen
  • $2348
  • 35mm
  • Eye-level viewfinder
  • In-camera panoramas

Compare Sigma fp vs Sony A7R II

Compared to Sony A7R IV

Sony A7R III
Sony A7R IV
  • $2204
  • 35mm
  • Less expensive
  • Bigger pixels
  • $3331
  • 35mm
  • Fast startup
  • More pixels

Compare Sony A7R III vs Sony A7R IV

Sigma fp
Sony A7R IV
  • $1699
  • 35mm
  • Less expensive
  • Bigger pixels
  • $3331
  • 35mm
  • Eye-level viewfinder
  • Tiltable Screen

Compare Sigma fp vs Sony A7R IV

Compared to Sony A7C

Sony A7R III
Sony A7C
  • $2204
  • 35mm
  • High resolution composite
  • Higher max flash sync
  • $1648
  • 35mm
  • Tilt-swivel screen
  • Bigger pixels

Compare Sony A7R III vs Sony A7C

Sigma fp
Sony A7C
  • $1699
  • 35mm
  • Thinner
  • More dots on screen
  • $1648
  • 35mm
  • Tilt-swivel screen
  • Eye-level viewfinder

Compare Sigma fp vs Sony A7C

Compared to Nikon Z7 II

Sony A7R III
Nikon Z7 II
  • $2204
  • 35mm
  • Less expensive
  • High resolution composite
  • $2330
  • 35mm
  • Top deck display
  • Newer

Compare Sony A7R III vs Nikon Z7 II

Sigma fp
Nikon Z7 II
  • $1699
  • 35mm
  • Less expensive
  • Bigger pixels
  • $2330
  • 35mm
  • Eye-level viewfinder
  • Tiltable Screen

Compare Sigma fp vs Nikon Z7 II

Compared to Sigma fp L

Sony A7R III
Sigma fp L
  • $2204
  • 35mm
  • Eye-level viewfinder
  • Bigger pixels
  • $2499
  • 35mm
  • Thinner
  • Newer

Compare Sony A7R III vs Sigma fp L

Sigma fp
Sigma fp L
  • $1699
  • 35mm
  • Bigger pixels
  • Higher max flash sync
  • $2499
  • 35mm
  • More pixels
  • Has anti-aliasing filter

Compare Sigma fp vs Sigma fp L

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