• 35mm 861.6mm2
  • 24.6 megapixels
  • ISO 200 - 3200
  • APS-C 364.3mm2
  • 19.6 megapixels
  • ISO 100 - 6400

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Differences

Sony A900 advantages over Sigma sd Quattro

  • Lens selection
    Good vs Limited
    Better lens selection gives you more options
  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Bigger pixels
    ~ 5.94 vs 4.33 microns
    Better low-light and dynamic range (all else equal)
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More pixels
    24.6 vs 19.6 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light

Sigma sd Quattro advantages over Sony A900

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • On-sensor phase detect
    Yes vs No
    Usually improves live view and video AF performance
  • Newer
    2 years vs 10 years old
    Newer cameras often support more advanced features
  • Lighter weight
    625g vs 939g
    Lighter weight
  • More dots on screen
    1620k vs 922k dots
    Can mean greater resolution or a brighter screen
  • Doesn't require an AA filter
    Yes vs No
    A unique sensor design provides sharp photos without moiré

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

  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • 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
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • Built-in GPS
    Neither provide
    Geotag your photos
  • Internal flash
    Neither provide
    Useful in a pinch for fill flash
  • External Mic Jack
    Neither provide
    Improved sound fidelity when shooting video
  • Headphone jack
    Neither provide
    Monitor audio recording while you shoot video
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Buy the Sigma sd Quattro

Review Excerpt

The Competition

Compared to Canon 5D Mark II

Sony A900
Canon 5D Mark II
  • $3000
  • 35mm
  • In-Camera Image Stabilization
  • More pixels
  • $2699
  • 35mm
  • Lens selection
  • Higher effective ISO
Sigma sd Quattro
Canon 5D Mark II
  • $732
  • APS-C
  • Less expensive
  • Focus peaking
  • $2699
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Sony A850

Sony A900
Sony A850
  • $3000
  • 35mm
  • Faster JPEG shooting
  • $2219
  • 35mm
  • Less expensive
  • Bigger JPEG buffer
Sigma sd Quattro
Sony A850
  • $732
  • APS-C
  • Focus peaking
  • On-sensor phase detect
  • $2219
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Canon 5D Mark III

Sony A900
Canon 5D Mark III
  • $3000
  • 35mm
  • In-Camera Image Stabilization
  • $2847
  • 35mm
  • Lens selection
  • Higher effective ISO
Sigma sd Quattro
Canon 5D Mark III
  • $732
  • APS-C
  • Less expensive
  • Focus peaking
  • $2847
  • 35mm
  • Lens selection
  • Larger sensor

Compared to Sigma sd Quattro H

Sony A900
Sigma sd Quattro H
  • $3000
  • 35mm
  • Lens selection
  • Larger sensor
  • $1099
  • APS-H
  • Focus peaking
  • On-sensor phase detect
Sigma sd Quattro
Sigma sd Quattro H
  • $732
  • APS-C
  • Less expensive
  • Bigger RAW buffer
  • $1099
  • APS-H
  • Larger sensor
  • More viewfinder magnification

Compared to Fujifilm X-H1

Sony A900
Fujifilm X-H1
  • $3000
  • 35mm
  • Larger sensor
  • Bigger pixels
  • $1649
  • APS-C
  • Focus peaking
  • Shoot 4K video
Sigma sd Quattro
Fujifilm X-H1
  • $732
  • APS-C
  • Less expensive
  • More dots on screen
  • $1649
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization
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