• APS-C 372.9mm2
  • 10.2 megapixels
  • ISO 100 - 1600
  • APS-C 355.7mm2
  • 14.2 megapixels
  • ISO 100 - 3200

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Differences

Nikon D3000 advantages over Nikon D3100

  • Less expensive
    $600 vs $700 (MSRP)
    Save money for lenses or accessories
  • Bigger pixels
    ~ 6.10 vs 5.01 microns
    Better low-light and dynamic range (all else equal)

Nikon D3100 advantages over Nikon D3000

  • Fast startup
    ~0.40 vs 0.7 sec
    Faster startup lets you catch the moment
  • Higher effective ISO
    919 vs 563 iso
    Take photos in low light with less noise
  • HDMI out
    HDMI out vs None
    Use HDMI output to monitor or review video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • More pixels
    14.2 vs 10.2 megapixels
    Higher resolution photos
  • Bigger JPEG buffer
    100 vs 16 shots
    Take more JPEG shots before waiting (burst mode)
  • Higher extended ISO
    12800 vs 3200 ISO
    Higher extended ISO can give more low-light flexibility

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
  • Tilt-swivel screen
    Neither provide
    Tilt and swivel the screen for maximum shooting flexibility
  • In-Camera Image Stabilization
    Neither provide
    Reduces the effects of camera shake at slower shutter speeds
  • 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
  • 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
  • External Mic Jack
    Neither provide
    Improved sound fidelity when shooting video
  • Pentaprism viewfinder
    Neither provide
    Much better viewfinder picture fidelity
  • 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 Canon XS

Nikon D3000
Canon XS
  • $450
  • APS-C
  • Less expensive
  • Larger sensor
  • $440
  • APS-C
  • Fast startup
  • Less shutter lag
Nikon D3100
Canon XS
  • $700
  • APS-C
  • HDMI out
  • Shoots 24p video
  • $440
  • APS-C
  • Fast startup
  • Less shutter lag

Compared to Sony DSLR-A230

Nikon D3000
Sony DSLR-A230
  • $450
  • APS-C
  • Lens selection
  • Faster JPEG shooting
  • $549
  • APS-C
  • In-Camera Image Stabilization
  • HDMI out
Nikon D3100
Sony DSLR-A230
  • $700
  • APS-C
  • Lens selection
  • Fast startup
  • $549
  • APS-C
  • Less expensive
  • In-Camera Image Stabilization

Compared to Sony DSLR-A330

Nikon D3000
Sony DSLR-A330
  • $450
  • APS-C
  • Lens selection
  • More viewfinder magnification
  • $530
  • APS-C
  • In-Camera Image Stabilization
  • Tiltable Screen
Nikon D3100
Sony DSLR-A330
  • $700
  • APS-C
  • Lens selection
  • Fast startup
  • $530
  • APS-C
  • In-Camera Image Stabilization
  • Bigger pixels

Compared to Sony A33

Nikon D3000
Sony A33
  • $450
  • APS-C
  • Lens selection
  • Less expensive
  • $540
  • APS-C
  • In-Camera Image Stabilization
  • In-camera panoramas
Nikon D3100
Sony A33
  • $700
  • APS-C
  • Lens selection
  • Fast startup
  • $540
  • APS-C
  • In-Camera Image Stabilization
  • In-camera panoramas

Compared to Pentax K-r

Nikon D3000
Pentax K-r
  • $450
  • APS-C
  • Less expensive
  • $850
  • APS-C
  • In-Camera Image Stabilization
  • Fast startup
Nikon D3100
Pentax K-r
  • $700
  • APS-C
  • Less expensive
  • Higher effective ISO
  • $850
  • APS-C
  • In-Camera Image Stabilization
  • Fast startup
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