• APS-C 355.7mm2
  • 14.2 megapixels
  • ISO 100 - 3200
  • APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 16,000

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Differences

Nikon D3100 advantages over Sony A58

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Bigger pixels
    ~ 5.01 vs 4.31 microns
    Better low-light and dynamic range (all else equal)
  • Fast startup
    ~0.40 vs 1.9 sec
    Faster startup lets you catch the moment
  • Higher effective ISO
    919 vs 753 iso
    Take photos in low light with less noise
  • Bigger JPEG buffer
    100 vs 8 shots
    Take more JPEG shots before waiting (burst mode)

Sony A58 advantages over Nikon D3100

  • Less expensive
    $600 vs $700 (MSRP)
    Save money for lenses or accessories
  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • 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
  • More dynamic range
    12.5 vs 11.2 evs
    Retain detail in highlight and shadows
  • Longer stills battery life
    More info 700 vs 550 shots
    Capture more 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
  • More dots on screen
    461k vs 230k dots
    Can mean greater resolution or a brighter screen
  • Less shutter lag
    0.13 vs 0.28 sec
    Focus and take a photo quickly (wide angle)
  • More pixels
    20.1 vs 14.2 megapixels
    Higher resolution photos
  • More AF points
    15 vs 11
    More AF points improve autofocus
  • Faster JPEG shooting
    4.9 fps vs 2.9 fps
    Faster JPEG shooting (burst mode)

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
  • 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
  • Built-in Wi-Fi
    Neither provide
    Share your photos wirelessly
  • 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
  • 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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Your purchases support this site

Review Excerpt

  • Improved 20.1-megapixel resolution; Impressive image quality, especially for its price; Fast and decisive autofocus (in most conditions); Very good battery life; Good video quality (Full HD 1080p, though it doesn't support 60p frame rate).

  • Plastic lens mount; Slower burst mode speeds and shallower buffer than A57; LCD no longer fully articulating; Mediocre kit lens; Electronic instead of an optical viewfinder may be a turnoff for some.

The Competition

Compared to Sony DSLR-A380

Nikon D3100
Sony DSLR-A380
  • $700
  • APS-C
  • Lens selection
  • Less expensive
  • $849
  • APS-C
  • In-Camera Image Stabilization
  • Tiltable Screen
Sony A58
Sony DSLR-A380
  • $598
  • APS-C
  • Less expensive
  • Focus peaking
  • $849
  • APS-C
  • Bigger pixels
  • Fast startup

Compared to Sony A33

Nikon D3100
Sony A33
  • $700
  • APS-C
  • Lens selection
  • Fast startup
  • $540
  • APS-C
  • In-Camera Image Stabilization
  • In-camera panoramas
Sony A58
Sony A33
  • $598
  • APS-C
  • Less expensive
  • Focus peaking
  • $540
  • APS-C
  • Bigger pixels
  • Fast startup

Compared to Pentax K-r

Nikon D3100
Pentax K-r
  • $700
  • APS-C
  • Less expensive
  • Higher effective ISO
  • $850
  • APS-C
  • In-Camera Image Stabilization
  • Fast startup
Sony A58
Pentax K-r
  • $598
  • APS-C
  • Less expensive
  • Focus peaking
  • $850
  • APS-C
  • Lens selection
  • Bigger pixels

Compared to Pentax K-5 IIs

Nikon D3100
Pentax K-5 IIs
  • $700
  • APS-C
  • Less expensive
  • Fast startup
  • $497
  • APS-C
  • In-Camera Image Stabilization
  • Higher effective ISO
Sony A58
Pentax K-5 IIs
  • $598
  • APS-C
  • Less expensive
  • Focus peaking
  • $497
  • APS-C
  • Lens selection
  • Fast startup

Compared to Canon T5i

Nikon D3100
Canon T5i
  • $700
  • APS-C
  • Bigger pixels
  • Fast startup
  • $539
  • APS-C
  • Tilt-swivel screen
  • Touchscreen
Sony A58
Canon T5i
  • $598
  • APS-C
  • Focus peaking
  • Larger sensor
  • $539
  • APS-C
  • Lens selection
  • Tilt-swivel screen
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