• 35mm 864.0mm2
  • 22.3 megapixels
  • ISO 100 - 25,600
  • APS-C 337.5mm2
  • 20.2 megapixels
  • ISO 100 - 12,800

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Differences

Canon 5D Mark III advantages over Canon 70D

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.25 vs 4.11 microns
    Better low-light and dynamic range (all else equal)
  • Fast startup
    ~0.50 vs 0.7 sec
    Faster startup lets you catch the moment
  • Higher effective ISO
    2,293 vs 926 iso
    Take photos in low light with less noise
  • More cross-type AF points
    41 vs 19
    Cross-type AF points improve autofocus performance
  • More viewfinder magnification
    0.71x vs 0.59x
    Get a bigger view of the scene through the eye-level viewfinder
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • More AF points
    61 vs 19
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Higher extended ISO
    102400 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Canon 70D advantages over Canon 5D Mark III

  • Less expensive
    $965 vs $2899
    Save money for lenses or accessories
  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Touchscreen
    Touch vs No touch
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Wi-Fi vs None
    Share your photos wirelessly
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Faster JPEG shooting
    6.7 fps vs 6.0 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    6.7 fps vs 6.0 fps
    Faster RAW shooting in burst mode

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
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • Pentaprism viewfinder
    Both provide
    Much better viewfinder picture fidelity
  • HDMI out
    Both provide
    Use an external screen 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

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • 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
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

Buy From

Your purchases support this site

Buy the Canon 5D Mark III

Your purchases support this site

Buy the Canon 70D

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.

  • Dual Pixel CMOS AF delivers full-time continuous autofocus (with phase detect at every pixel in framing area) for video and Live View still shooting; Full HD (1080p) video recording with pro-level features and quality; Improved resolution and good high ISO performance; Excellent Wi-Fi remote shooting with full exposure controls; 3-inch articulating LCD touchscreen.

  • Image quality only improved slightly over 60D; Dynamic range still lags behind competing models; May not feature enough upgrades to convince people to step up from 60D.

The Competition

Compared to Canon 6D

Canon 5D Mark III
Canon 6D
  • $2817
  • 35mm
  • More cross-type AF points
  • Less shutter lag
  • $1356
  • 35mm
  • Less expensive
  • Built-in Wi-Fi
Canon 70D
Canon 6D
  • $1156
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $1356
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Nikon D7100

Canon 5D Mark III
Nikon D7100
  • $2817
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $697
  • APS-C
  • Less expensive
  • Fast startup
Canon 70D
Nikon D7100
  • $1156
  • APS-C
  • Tilt-swivel screen
  • Touchscreen
  • $697
  • APS-C
  • Fast startup
  • Higher effective ISO

Compared to Canon 5D Mark IV

Canon 5D Mark III
Canon 5D Mark IV
  • $2817
  • 35mm
  • Less expensive
  • Bigger pixels
  • $3299
  • 35mm
  • Shoot 4K video
  • Touchscreen
Canon 70D
Canon 5D Mark IV
  • $1156
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $3299
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Sony A850

Canon 5D Mark III
Sony A850
  • $2817
  • 35mm
  • Lens selection
  • Higher effective ISO
  • $2219
  • 35mm
  • In-Camera Image Stabilization
Canon 70D
Sony A850
  • $1156
  • APS-C
  • Lens selection
  • Tilt-swivel screen
  • $2219
  • 35mm
  • Larger sensor
  • In-Camera Image Stabilization

Compared to Sony A99

Canon 5D Mark III
Sony A99
  • $2817
  • 35mm
  • Lens selection
  • Fast startup
  • $1998
  • 35mm
  • Less expensive
  • Tilt-swivel screen
Canon 70D
Sony A99
  • $1156
  • APS-C
  • Lens selection
  • Less expensive
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
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