• 35mm 864.0mm2
  • 22.3 megapixels
  • ISO 100 - 25,600
  • APS-C 369.7mm2
  • 16.1 megapixels
  • ISO 100 - 16,000

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Differences

Canon 5D Mark III advantages over Sony A57

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.25 vs 4.82 microns
    Better low-light and dynamic range (all else equal)
  • Higher effective ISO
    2,293 vs 785 iso
    Take photos in low light with less noise
  • Longer stills battery life
    More info 950 vs 550 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    41 vs 3
    Cross-type AF points improve autofocus performance
  • More pixels
    22.3 vs 16.1 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • More AF points
    61 vs 15
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Bigger JPEG buffer
    63 vs 25 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    102400 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Sony A57 advantages over Canon 5D Mark III

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • More dynamic range
    13.0 vs 11.7 evs
    Retain detail in highlight and shadows
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Faster JPEG shooting
    10.0 fps vs 6.0 fps
    Faster JPEG shooting (burst mode)

Similarities

Common Strengths

  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • 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

  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • NFC
    Neither provide
    Simplifies pairing your camera with supported phones
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Built-in GPS
    Neither provide
    Geotag your photos
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Buy the Canon 5D Mark III

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Review Excerpt

  • Superb still and video image quality; Powerful, fast, and accurate AF system with loads of cross-type points, loads of configurability and great frame coverage; Rugged, weather-sealed body with great control layout and user-interface configurability.

  • Dynamic range is limited by noise in deep shadows; Somewhat heavy-handed noise suppression and sharpening at default settings. (Shooting RAW avoids both.); No AF illuminator.

The Competition

Compared to Canon 6D

Canon 5D Mark III
Canon 6D
  • $2079
  • 35mm
  • More cross-type AF points
  • Less shutter lag
  • $1699
  • 35mm
  • Less expensive
  • Built-in Wi-Fi
Sony A57
Canon 6D
  • $800
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1699
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Canon 5D Mark IV

Canon 5D Mark III
Canon 5D Mark IV
  • $2079
  • 35mm
  • Less expensive
  • Bigger pixels
  • $2249
  • 35mm
  • Shoot 4K video
  • Touchscreen
Sony A57
Canon 5D Mark IV
  • $800
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $2249
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Sony A850

Canon 5D Mark III
Sony A850
  • $2079
  • 35mm
  • Lens selection
  • Higher effective ISO
  • $2219
  • 35mm
  • In-Camera Image Stabilization
Sony A57
Sony A850
  • $800
  • APS-C
  • Less expensive
  • Focus peaking
  • $2219
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Nikon D5100

Canon 5D Mark III
Nikon D5100
  • $2079
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $650
  • APS-C
  • Tilt-swivel screen
  • More dynamic range
Sony A57
Nikon D5100
  • $800
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $650
  • APS-C
  • Lens selection
  • Tilt-swivel screen

Compared to Nikon D800E

Canon 5D Mark III
Nikon D800E
  • $2079
  • 35mm
  • Bigger pixels
  • More cross-type AF points
  • $2212
  • 35mm
  • Fast startup
  • Higher effective ISO
Sony A57
Nikon D800E
  • $800
  • APS-C
  • Less expensive
  • Focus peaking
  • $2212
  • 35mm
  • Lens selection
  • Larger sensor
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