• APS-C 369.7mm2
  • 16.2 megapixels
  • ISO 100 - 12,800
  • APS-C 369.0mm2
  • 14.8 megapixels
  • ISO 100 - 6400

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Differences

Sony A55 advantages over Sigma SD1 Merrill

  • Lens selection
    Good vs Limited
    Better lens selection gives you more options
  • 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
  • Fast startup
    ~0.90 vs 4.5 sec
    Faster startup lets you catch the moment
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    3 vs 1
    Cross-type AF points improve autofocus performance
  • HDMI out
    HDMI out vs None
    Use HDMI output to monitor or review video
  • More dots on screen
    922k vs 460k dots
    Can mean greater resolution or a brighter screen
  • Less shutter lag
    0.22 vs 0.38 sec
    Focus and take a photo quickly (wide angle)
  • More viewfinder magnification
    0.73x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More AF points
    15 vs 11
    More AF points improve autofocus
  • Faster JPEG shooting
    9.0 fps vs 4.1 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    32 vs 7 shots
    Take more JPEG shots before waiting (burst mode)
  • Higher extended ISO
    25600 vs 6400 ISO
    Higher extended ISO can give more low-light flexibility

Sigma SD1 Merrill advantages over Sony A55

  • Doesn't require an AA filter
    Yes vs No
    A unique sensor design provides sharp photos without moiré
  • Faster shutter
    1/8000 vs 1/4000 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
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • 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
  • Touchscreen
    Neither provide
    Interact with your camera just like your smartphone
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • Built-in Bluetooth
    Neither provide
    Always-on wireless connectivity
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Top deck display
    Neither provide
    Check settings with a screen on top of the camera
  • Dual card slots
    Neither provide
    Gives you more storage flexibility
  • 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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Review Excerpt

The Competition

Compared to Nikon D300S

Sony A55
Nikon D300S
  • $734
  • APS-C
  • In-Camera Image Stabilization
  • In-camera panoramas
  • $1663
  • APS-C
  • Lens selection
  • Fast startup
Sigma SD1 Merrill
Nikon D300S
  • $1799
  • APS-C
  • More pixels
  • Doesn't require an AA filter
  • $1663
  • APS-C
  • Lens selection
  • Less expensive

Compared to Sony DSLR-A550

Sony A55
Sony DSLR-A550
  • $734
  • APS-C
  • Less expensive
  • In-camera panoramas
  • $859
  • APS-C
  • Fast startup
  • Longer stills battery life
Sigma SD1 Merrill
Sony DSLR-A550
  • $1799
  • APS-C
  • Pentaprism viewfinder
  • More viewfinder magnification
  • $859
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization

Compared to Canon T2i

Sony A55
Canon T2i
  • $734
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization
  • $692
  • APS-C
  • Lens selection
  • Fast startup
Sigma SD1 Merrill
Canon T2i
  • $1799
  • APS-C
  • Larger sensor
  • Bigger pixels
  • $692
  • APS-C
  • Lens selection
  • Fast startup

Compared to Sony A33

Sony A55
Sony A33
  • $734
  • APS-C
  • Higher effective ISO
  • Built-in GPS
  • $540
  • APS-C
Sigma SD1 Merrill
Sony A33
  • $1799
  • APS-C
  • Doesn't require an AA filter
  • Faster shutter
  • $540
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization

Compared to Sony A35

Sony A55
Sony A35
  • $734
  • APS-C
  • Tiltable Screen
  • Built-in GPS
  • $567
  • APS-C
  • Less expensive
  • Longer stills battery life
Sigma SD1 Merrill
Sony A35
  • $1799
  • APS-C
  • Doesn't require an AA filter
  • Faster shutter
  • $567
  • APS-C
  • Lens selection
  • In-Camera Image Stabilization
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