• APS-C 368.2mm2
  • 16.2 megapixels
  • ISO 100 - 6400
  • 35mm 855.6mm2
  • 24.3 megapixels
  • ISO 100 - 25,600

Buy From

Differences

Nikon D5100 advantages over Sony A99

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Less expensive
    $900 vs $2800 (MSRP)
    Save money for lenses or accessories
  • Fast startup
    ~0.50 vs 0.7 sec
    Faster startup lets you catch the moment
  • Longer stills battery life
    More info 660 vs 500 shots
    Capture more photos
  • Internal flash
    Internal flash vs None
    Useful in a pinch for fill flash
  • Bigger JPEG buffer
    100 vs 17 shots
    Take more JPEG shots before waiting (burst mode)

Sony A99 advantages over Nikon D5100

  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • Larger sensor
    35mm vs APS-C
    More sensor area. Bigger is (generally) better.
  • In-Camera Image Stabilization
    Yes vs No
    Reduces the effects of camera shake at slower shutter speeds
  • Bigger pixels
    ~ 5.97 vs 4.79 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Higher effective ISO
    1,555 vs 1,183 iso
    Take photos in low light with less noise
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More cross-type AF points
    3 vs 1
    Cross-type AF points improve autofocus performance
  • More dots on screen
    1229k vs 922k dots
    Can mean greater resolution or a brighter screen
  • Less shutter lag
    0.13 vs 0.27 sec
    Focus and take a photo quickly (wide angle)
  • More viewfinder magnification
    0.71x vs 0.52x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    24.3 vs 16.2 megapixels
    Higher resolution photos
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • More AF points
    19 vs 11
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Faster JPEG shooting
    5.9 fps vs 3.9 fps
    Faster JPEG shooting (burst mode)
  • Faster RAW shooting
    5.9 fps vs 4.0 fps
    Faster RAW shooting in burst mode
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    51200 vs 25600 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Tilt-swivel screen
    Both provide
    Tilt and swivel the screen for maximum shooting flexibility
  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • External Mic Jack
    Both provide
    Improved sound fidelity when shooting video
  • 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

  • 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
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

Buy From

Review Excerpt

  • Side-mounted tilt / swivel LCD screen; same sensor and processing as the Nikon D7000; good speed and battery life; in-camera HDR and filter effects; Full HD video capture with aperture control; audio levels control and external microphone jack.

  • AF-S lens mount doesn't offer autofocus with screw-drive lenses; popup flash isn't the greatest; no built-in wireless flash control; HDR function doesn't microalign source images.

The Competition

Compared to Sony A55

Nikon D5100
Sony A55
  • $650
  • APS-C
  • Lens selection
  • Tilt-swivel screen
  • $734
  • APS-C
  • In-Camera Image Stabilization
  • In-camera panoramas
Sony A99
Sony A55
  • $1998
  • 35mm
  • Focus peaking
  • Larger sensor
  • $734
  • APS-C
  • Less expensive
  • Internal flash

Compared to Sony A33

Nikon D5100
Sony A33
  • $650
  • APS-C
  • Lens selection
  • Tilt-swivel screen
  • $540
  • APS-C
  • Less expensive
  • In-Camera Image Stabilization
Sony A99
Sony A33
  • $1998
  • 35mm
  • Tilt-swivel screen
  • Focus peaking
  • $540
  • APS-C
  • Less expensive
  • Internal flash

Compared to Nikon D800

Nikon D5100
Nikon D800
  • $650
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $1850
  • 35mm
  • Larger sensor
  • Fast startup
Sony A99
Nikon D800
  • $1998
  • 35mm
  • Tilt-swivel screen
  • Focus peaking
  • $1850
  • 35mm
  • Lens selection
  • Fast startup

Compared to Canon 5D Mark III

Nikon D5100
Canon 5D Mark III
  • $650
  • APS-C
  • Tilt-swivel screen
  • More dynamic range
  • $2079
  • 35mm
  • Larger sensor
  • Bigger pixels
Sony A99
Canon 5D Mark III
  • $1998
  • 35mm
  • Focus peaking
  • Tilt-swivel screen
  • $2079
  • 35mm
  • Lens selection
  • Fast startup

Compared to Sony A57

Nikon D5100
Sony A57
  • $650
  • APS-C
  • Lens selection
  • Tilt-swivel screen
  • $800
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
Sony A99
Sony A57
  • $1998
  • 35mm
  • Larger sensor
  • Tilt-swivel screen
  • $800
  • APS-C
  • Less expensive
  • Internal flash
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