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

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Differences

Canon 5D Mark III advantages over Canon 90D

  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • Bigger pixels
    ~ 6.25 vs 3.23 microns
    Better low-light and dynamic range (all else equal)
  • 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 45
    More AF points improve autofocus
  • Higher extended ISO
    102400 vs 51200 ISO
    Higher extended ISO can give more low-light flexibility

Canon 90D advantages over Canon 5D Mark III

  • Less expensive
    $1349 vs $2299
    Save money for lenses or accessories
  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Shoot 4K video
    4K (UHD) vs 1080p
    Make sure you have a fast computer
  • 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
  • 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
  • Longer stills battery life
    More info 1300 vs 950 shots
    Capture more photos
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Newer
    2 years vs 10 years old
    Newer cameras often support more advanced features
  • More pixels
    32.5 vs 22.3 megapixels
    Higher resolution photos
  • Faster JPEG shooting
    10.0 fps vs 6.0 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    10.0 fps vs 6.0 fps
    Faster RAW shooting in burst mode
  • Bigger RAW buffer
    27 vs 18 shots
    Larger buffer for RAW shots (burst mode)
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos
  • Faster shutter
    1/16000 vs 1/8000 sec
    Shoot wide open in bright light

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 HDMI output to monitor or review video
  • Hot shoe
    Both provide
    Off-camera flashes open new possibilities
  • 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

  • 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 GPS
    Neither provide
    Geotag your photos

User reviews

Buy From

Your purchases support this site

Buy the Canon 5D Mark III

Your purchases support this site

Buy the Canon 90D

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.

  • Highest resolution Canon APS-C camera yet; Great image quality; Faster 10fps burst shooting; Very fast autofocus; Dual Pixel CMOS AF in Live View; 4K video; 1080p120 slow-mo video.

  • Low-pass filter reduces fine detail from high-res sensor; High ISO performance isn't as good as some rival cameras; Video recording limited to 29:59.

The Competition

Compared to Canon 6D

Canon 5D Mark III
Canon 6D
  • $2899
  • 35mm
  • More cross-type AF points
  • Less shutter lag
  • $1699
  • 35mm
  • Less expensive
  • Built-in Wi-Fi
Canon 90D
Canon 6D
  • $1199
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $1699
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Canon 5D Mark IV

Canon 5D Mark III
Canon 5D Mark IV
  • $2899
  • 35mm
  • Less expensive
  • Bigger pixels
  • $2813
  • 35mm
  • Shoot 4K video
  • Touchscreen
Canon 90D
Canon 5D Mark IV
  • $1199
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $2813
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Sony A850

Canon 5D Mark III
Sony A850
  • $2899
  • 35mm
  • Lens selection
  • Higher effective ISO
  • $2219
  • 35mm
  • In-Camera Image Stabilization
Canon 90D
Sony A850
  • $1199
  • APS-C
  • Tilt-swivel screen
  • Lens selection
  • $2219
  • 35mm
  • Larger sensor
  • In-Camera Image Stabilization

Compared to Nikon D800E

Canon 5D Mark III
Nikon D800E
  • $2899
  • 35mm
  • Bigger pixels
  • More cross-type AF points
  • $2212
  • 35mm
  • Fast startup
  • Higher effective ISO
Canon 90D
Nikon D800E
  • $1199
  • APS-C
  • Tilt-swivel screen
  • Shoot 4K video
  • $2212
  • 35mm
  • Larger sensor
  • Bigger pixels

Compared to Sony A99

Canon 5D Mark III
Sony A99
  • $2899
  • 35mm
  • Lens selection
  • Fast startup
  • $1998
  • 35mm
  • Less expensive
  • Tilt-swivel screen
Canon 90D
Sony A99
  • $1199
  • APS-C
  • Less expensive
  • Lens selection
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
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