• APS-C 355.7mm2
  • 14.2 megapixels
  • ISO 100 - 3200
  • 1/2.3 inch 28.1mm2
  • 16.0 megapixels
  • 28.00mm - 140.00mm (35mm eq.)

Buy From

Differences

Nikon D3100 advantages over Pentax WG-2 GPS

  • 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
  • Bigger pixels
    ~ 5.01 vs 1.34 microns
    Better low-light and dynamic range (all else equal)
  • RAW file ability
    Yes vs No
    Gives you more flexibility to develop your photos later
  • Longer stills battery life
    More info 550 vs 260 shots
    Capture more photos
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • Hot shoe
    Hot shoe vs None
    Off-camera flashes open new possibilities
  • Longer exposure
    30 vs 4 sec
    Long exposures for night shots
  • Bulb shutter
    Bulb vs No bulb
    Hold the shutter open manually for long exposures
  • Faster JPEG shooting
    2.9 fps vs 1.0 fps
    Faster JPEG shooting (burst mode)
  • Higher extended ISO
    12800 vs 6400 ISO
    Higher extended ISO can give more low-light flexibility

Pentax WG-2 GPS advantages over Nikon D3100

  • Less expensive
    $400 vs $700 (MSRP)
    Save money for lenses or accessories
  • Waterproof
    Yes vs No
    Take photos underwater without destroying your camera!
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • Thinner
    30 mm vs 74 mm
    Thinner
  • More dots on screen
    460k vs 230k dots
    Can mean greater resolution or a brighter screen
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options

Similarities

Common Strengths

  • Rear display
    Both provide
    Review photos on the back of the camera
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • Manual focus
    Both provide
    AF is for the weak. Real photographers focus manually.
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video

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
  • 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
  • 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
  • External Mic Jack
    Neither provide
    Improved sound fidelity when shooting video
  • 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

Buy From

Review Excerpt

The Competition

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
Pentax WG-2 GPS
Sony A33
  • $330
  • 1/2.3 inch
  • Less expensive
  • Waterproof
  • $540
  • APS-C
  • Larger sensor
  • Eye-level viewfinder

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
Pentax WG-2 GPS
Pentax K-r
  • $330
  • 1/2.3 inch
  • Less expensive
  • Waterproof
  • $850
  • APS-C
  • Larger sensor
  • Eye-level viewfinder

Compared to Nikon D5100

Nikon D3100
Nikon D5100
  • $700
  • APS-C
  • $499
  • APS-C
  • Tilt-swivel screen
  • Higher effective ISO
Pentax WG-2 GPS
Nikon D5100
  • $330
  • 1/2.3 inch
  • Waterproof
  • In-Camera Image Stabilization
  • $499
  • APS-C
  • Tilt-swivel screen
  • Larger sensor

Compared to Pentax WG-2

Nikon D3100
Pentax WG-2
  • $700
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
  • $199
  • 1/2.3 inch
  • Waterproof
  • In-Camera Image Stabilization
Pentax WG-2 GPS
Pentax WG-2
  • $330
  • 1/2.3 inch
  • Built-in GPS
  • $199
  • 1/2.3 inch

Compared to Olympus TG-850

Nikon D3100
Olympus TG-850
  • $700
  • APS-C
  • Larger sensor
  • Eye-level viewfinder
  • $249
  • 1/2.3 inch
  • Waterproof
  • In-Camera Image Stabilization
Pentax WG-2 GPS
Olympus TG-850
  • $330
  • 1/2.3 inch
  • More telephoto lens reach
  • Built-in GPS
  • $249
  • 1/2.3 inch
  • In-camera panoramas
  • Tiltable Screen
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