• APS-H 525.5mm2
  • 10.1 megapixels
  • ISO 100 - 3200
  • 35mm 864.0mm2
  • 22.3 megapixels
  • ISO 100 - 25,600

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Differences

Canon 1D Mark III advantages over Canon 5D Mark III

  • Bigger pixels
    ~ 7.23 vs 6.25 microns
    Better low-light and dynamic range (all else equal)
  • Fast startup
    ~0.10 vs 0.5 sec
    Faster startup lets you catch the moment
  • Longer stills battery life
    More info 2200 vs 950 shots
    Capture more photos
  • Higher max flash sync
    1/300 vs 1/200 sec
    Reduce the effect of ambient light in flash shots
  • Faster JPEG shooting
    9.9 fps vs 6.0 fps
    Faster JPEG shooting (burst mode)

Canon 5D Mark III advantages over Canon 1D Mark III

  • Larger sensor
    35mm vs APS-H
    More sensor area. Bigger is (generally) better.
  • Higher effective ISO
    2,293 vs 1,078 iso
    Take photos in low light with less noise
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    41 vs 19
    Cross-type AF points improve autofocus performance
  • Pentaprism viewfinder
    Pentaprism vs Pentamirror
    Much better viewfinder picture fidelity
  • Newer
    7 years vs 12 years old
    Newer cameras often support more advanced features
  • HDMI out
    HDMI out vs None
    Use HDMI output to monitor or review video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • More dots on screen
    1044k vs 230k dots
    Can mean greater resolution or a brighter screen
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • More viewfinder magnification
    0.71x vs 0.58x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    22.3 vs 10.1 megapixels
    Higher resolution photos
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • More AF points
    61 vs 19
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Bigger JPEG buffer
    63 vs 12 shots
    Take more JPEG shots before waiting (burst mode)
  • Higher extended ISO
    102400 vs 6400 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • Top deck display
    Both provide
    Check settings with a screen on top of the camera
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • Dual card slots
    Both provide
    Gives you more storage flexibility
  • Bulb shutter
    Both provide
    Hold the shutter open manually for long exposures

Common Weaknesses

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Neither provide
    Tilt the screen for shooting flexbility
  • 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
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Buy the Canon 5D Mark III

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 1D Mark III
Canon 6D
  • $4500
  • APS-H
  • Fast startup
  • Longer stills battery life
  • $999
  • 35mm
  • Larger sensor
  • Built-in Wi-Fi
Canon 5D Mark III
Canon 6D
  • $2474
  • 35mm
  • More cross-type AF points
  • Less shutter lag
  • $999
  • 35mm
  • Less expensive
  • Built-in Wi-Fi

Compared to Canon 5D Mark IV

Canon 1D Mark III
Canon 5D Mark IV
  • $4500
  • APS-H
  • Bigger pixels
  • Fast startup
  • $2799
  • 35mm
  • Larger sensor
  • Shoot 4K video
Canon 5D Mark III
Canon 5D Mark IV
  • $2474
  • 35mm
  • Less expensive
  • Bigger pixels
  • $2799
  • 35mm
  • Shoot 4K video
  • Touchscreen

Compared to Sony A850

Canon 1D Mark III
Sony A850
  • $4500
  • APS-H
  • Lens selection
  • Bigger pixels
  • $2219
  • 35mm
  • Less expensive
  • Larger sensor
Canon 5D Mark III
Sony A850
  • $2474
  • 35mm
  • Lens selection
  • Higher effective ISO
  • $2219
  • 35mm
  • In-Camera Image Stabilization

Compared to Nikon D800E

Canon 1D Mark III
Nikon D800E
  • $4500
  • APS-H
  • Bigger pixels
  • Fast startup
  • $2212
  • 35mm
  • Less expensive
  • Larger sensor
Canon 5D Mark III
Nikon D800E
  • $2474
  • 35mm
  • Bigger pixels
  • More cross-type AF points
  • $2212
  • 35mm
  • Fast startup
  • Higher effective ISO

Compared to Sony A99

Canon 1D Mark III
Sony A99
  • $4500
  • APS-H
  • Lens selection
  • Bigger pixels
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
Canon 5D Mark III
Sony A99
  • $2474
  • 35mm
  • Lens selection
  • Fast startup
  • $1998
  • 35mm
  • Less expensive
  • Tilt-swivel screen
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