• 1/2.3 inch 28.1mm2
  • 12.1 megapixels
  • 25.00mm - 450.00mm (35mm eq.)
  • APS-C 369.7mm2
  • 24.3 megapixels
  • ISO 100 - 16,000

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Differences

Nikon S9100 advantages over Sony A77

  • Less expensive
    $330 vs $2000 (MSRP)
    Save money for lenses or accessories
  • Thinner
    34 mm vs 80 mm
    Thinner
  • Slow-motion videos
    Yes vs No
    Shoot slow-motion videos

Sony A77 advantages over Nikon S9100

  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Focus peaking
    Peaker vs Non-peaker
    Your camera will highlight what's in focus
  • 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
    ~ 3.95 vs 1.54 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
  • Fast startup
    ~0.80 vs 1.5 sec
    Faster startup lets you catch the moment
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • Longer stills battery life
    More info 530 vs 270 shots
    Capture more photos
  • 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
  • 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
  • Less shutter lag
    0.12 vs 0.22 sec
    Focus and take a photo quickly (wide angle)
  • More pixels
    24.3 vs 12.1 megapixels
    Higher resolution photos
  • 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
    11.6 fps vs 9.5 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    17 vs 5 shots
    Take more JPEG shots before waiting (burst mode)
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light
  • Higher extended ISO
    16000 vs 3200 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Rear display
    Both provide
    Review photos on the back of the camera
  • In-Camera Image Stabilization
    Both provide
    Reduces the effects of camera shake at slower shutter speeds
  • In-camera panoramas
    Both provide
    Stitches multiple shots into a panoramic photo
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • HDMI out
    Both provide
    Use HDMI output to monitor or review video

Common Weaknesses

  • 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

User reviews

Buy From

Your purchases support this site

Your purchases support this site

Buy the Sony A77

Review Excerpt

  • Backside-illuminated sensor for good low-light performance; Very long zoom; Good printed performance; Very fast autofocus.

  • Autofocus is not always reliable; Auto white balance renders skin tones a little red; Slow digital zoom.

  • Very fast top frame rate; full-time phase-detect autofocus; Full 60p HD video; Excellent kit lens; Very good high-resolution sensor.

  • Heavy; EVF appears dim when used in bright light; AF tracking in Movie mode was unreliable in our testing.

The Competition

Compared to Pentax RZ18

Nikon S9100
Pentax RZ18
  • $254
  • 1/2.3 inch
  • Bigger pixels
  • In-camera panoramas
  • $210
  • 1/2.33 inch
  • Manual focus
  • More pixels
Sony A77
Pentax RZ18
  • $1899
  • APS-C
  • Tilt-swivel screen
  • Focus peaking
  • $210
  • 1/2.33 inch
  • Less expensive
  • Thinner

Compared to Panasonic ZS15

Nikon S9100
Panasonic ZS15
  • $254
  • 1/2.3 inch
  • In-camera panoramas
  • More telephoto lens reach
  • $273
  • 1/2.3 inch
  • Less expensive
  • Longer exposure
Sony A77
Panasonic ZS15
  • $1899
  • APS-C
  • Tilt-swivel screen
  • Focus peaking
  • $273
  • 1/2.3 inch
  • Less expensive
  • Thinner

Compared to Canon SX280 HS

Nikon S9100
Canon SX280 HS
  • $254
  • 1/2.3 inch
  • In-camera panoramas
  • Longer stills battery life
  • $300
  • 1/2.3 inch
  • Built-in Wi-Fi
  • Built-in GPS
Sony A77
Canon SX280 HS
  • $1899
  • APS-C
  • Focus peaking
  • Larger sensor
  • $300
  • 1/2.3 inch
  • Less expensive
  • Built-in Wi-Fi

Compared to Canon 70D

Nikon S9100
Canon 70D
  • $254
  • 1/2.3 inch
  • In-Camera Image Stabilization
  • In-camera panoramas
  • $999
  • APS-C
  • Larger sensor
  • Tilt-swivel screen
Sony A77
Canon 70D
  • $1899
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $999
  • APS-C
  • Lens selection
  • Touchscreen

Compared to Sony A77 II

Nikon S9100
Sony A77 II
  • $254
  • 1/2.3 inch
  • Thinner
  • Slow-motion videos
  • $1198
  • APS-C
  • Tilt-swivel screen
  • Focus peaking
Sony A77
Sony A77 II
  • $1899
  • APS-C
  • Built-in GPS
  • $1198
  • APS-C
  • Built-in Wi-Fi
  • NFC
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