• 1/2.3 inch 28.1mm2
  • 12.0 megapixels
  • 27.00mm - 108.00mm (35mm eq.)
  • APS-C 369.7mm2
  • 16.2 megapixels
  • ISO 100 - 12,800

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Differences

Nikon S4000 advantages over Sony A55

  • Less expensive
    $200 vs $850 (MSRP)
    Save money for lenses or accessories
  • Thinner
    20 mm vs 84 mm
    Thinner

Sony A55 advantages over Nikon S4000

  • Larger sensor
    APS-C vs 1/2.3 inch
    More sensor area. Bigger is (generally) better.
  • Eye-level viewfinder
    Eye-level vs Rear display only
    You'll be able to frame photos even when the sun is out
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Bigger pixels
    ~ 4.82 vs 1.54 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Manual focus
    Yes vs No
    AF is for the weak. Real photographers focus manually.
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • 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
  • Hot shoe
    Hot shoe vs None
    Off-camera flashes open new possibilities
  • More pixels
    16.2 vs 12.0 megapixels
    Higher resolution photos
  • Bulb shutter
    Bulb vs No bulb
    Hold the shutter open manually for long exposures

Similarities

Common Strengths

  • Rear display
    Both provide
    Review photos on the back of the camera

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
  • Integrated ND filter
    Neither provide
    Shoot in daylight with a large aperture or slow shutter
  • 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

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Review Excerpt

The Competition

Compared to Nikon S3000

Nikon S4000
Nikon S3000
  • $200
  • 1/2.3 inch
  • More dots on screen
  • $150
  • 1/2.3 inch
  • Less expensive
  • Internal flash
Sony A55
Nikon S3000
  • $734
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
  • $150
  • 1/2.3 inch
  • Less expensive
  • Thinner

Compared to Sony A33

Nikon S4000
Sony A33
  • $200
  • 1/2.3 inch
  • Less expensive
  • Thinner
  • $540
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
Sony A55
Sony A33
  • $734
  • APS-C
  • Higher effective ISO
  • Built-in GPS
  • $540
  • APS-C

Compared to Pentax RS1000

Nikon S4000
Pentax RS1000
  • $200
  • 1/2.3 inch
  • More dots on screen
  • $117
  • 1/2.3 inch
  • Less expensive
  • Internal flash
Sony A55
Pentax RS1000
  • $734
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
  • $117
  • 1/2.3 inch
  • Less expensive
  • Thinner

Compared to Nikon S4100

Nikon S4000
Nikon S4100
  • $200
  • 1/2.3 inch
  • $180
  • 1/2.3 inch
  • More telephoto lens reach
  • Internal flash
Sony A55
Nikon S4100
  • $734
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
  • $180
  • 1/2.3 inch
  • Less expensive
  • Thinner

Compared to Sony A35

Nikon S4000
Sony A35
  • $200
  • 1/2.3 inch
  • Less expensive
  • Thinner
  • $567
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
Sony A55
Sony A35
  • $734
  • APS-C
  • Tiltable Screen
  • Built-in GPS
  • $567
  • APS-C
  • Less expensive
  • Longer stills battery life
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