• APS-C 369.7mm2
  • 16.1 megapixels
  • ISO 100 - 16,000
  • APS-C 366.6mm2
  • 24.1 megapixels
  • ISO 100 - 6400

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Differences

Sony A57 advantages over Nikon D7100

  • 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
  • Bigger pixels
    ~ 4.82 vs 3.92 microns
    Better low-light and dynamic range (all else equal)
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Lighter weight
    828g vs 1222g
    Lighter weight
  • More viewfinder magnification
    0.69x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • Has anti-aliasing filter
    Filter vs No Filter
    Reduces unsightly moiré in photos
  • Faster JPEG shooting
    10.0 fps vs 5.8 fps
    Faster JPEG shooting (burst mode)
  • Bigger JPEG buffer
    25 vs 12 shots
    Take more JPEG shots before waiting (burst mode)

Nikon D7100 advantages over Sony A57

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Higher effective ISO
    1,256 vs 785 iso
    Take photos in low light with less noise
  • Longer stills battery life
    More info 950 vs 550 shots
    Capture more photos
  • More telephoto lens reach
    158 mm vs 83 mm
    Capture objects farther away with the kit lens
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More cross-type AF points
    15 vs 3
    Cross-type AF points improve autofocus performance
  • Higher max flash sync
    1/250 vs 1/160 sec
    Reduce the effect of ambient light in flash shots
  • More pixels
    24.1 vs 16.1 megapixels
    Higher resolution photos
  • Dual card slots
    Yes vs No
    Gives you more storage flexibility
  • More AF points
    51 vs 15
    More AF points improve autofocus
  • Headphone jack
    Yes vs No
    Monitor audio recording while you shoot video
  • Lacks anti-aliasing filter
    No Filter vs Filter
    Enjoy sharper photos
  • Faster shutter
    1/8000 vs 1/4000 sec
    Shoot wide open in bright light

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

  • 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
  • Slow-motion videos
    Neither provide
    Shoot slow-motion videos

User reviews

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Your purchases support this site

Buy the Nikon D7100

Review Excerpt

  • Solid, ergonomic body design; Stunning, highly detailed photos, thanks to 24.1MP sensor upgrade and removal of optical low-pass filter; Cool 1.3x crop mode extends reach to nearly 2x the full-frame equivalent; Records Full 1080p HD video at up to 30fps with full-time AF; Many pro-level features packed into a consumer-friendly body at reasonable price.

  • Shallow buffer that hampers continuous burst shooting; AF slightly slower than average for its class; No real-time aperture control while in Movie mode (among other quirks); More noticeable moire patterns and aliasing artifacts (but only found when shooting fabrics with strong, distinct patterns).

The Competition

Compared to Canon 70D

Sony A57
Canon 70D
  • $800
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $999
  • APS-C
  • Lens selection
  • Tilt-swivel screen
Nikon D7100
Canon 70D
  • $695
  • APS-C
  • Fast startup
  • Higher effective ISO
  • $999
  • APS-C
  • Tilt-swivel screen
  • Touchscreen

Compared to Nikon D5100

Sony A57
Nikon D5100
  • $800
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $650
  • APS-C
  • Lens selection
  • Tilt-swivel screen
Nikon D7100
Nikon D5100
  • $695
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $650
  • APS-C
  • Less expensive
  • Tilt-swivel screen

Compared to Sony A37

Sony A57
Sony A37
  • $800
  • APS-C
  • Longer stills battery life
  • Higher-res screen
  • $600
  • APS-C
  • Less expensive
  • External Mic Jack
Nikon D7100
Sony A37
  • $695
  • APS-C
  • Lens selection
  • Fast startup
  • $600
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization

Compared to Pentax K-5 IIs

Sony A57
Pentax K-5 IIs
  • $800
  • APS-C
  • Less expensive
  • Focus peaking
  • $497
  • APS-C
  • Lens selection
  • Higher effective ISO
Nikon D7100
Pentax K-5 IIs
  • $695
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $497
  • APS-C
  • In-Camera Image Stabilization
  • Bigger pixels

Compared to Pentax K-3

Sony A57
Pentax K-3
  • $800
  • APS-C
  • Less expensive
  • Bigger pixels
  • $699
  • APS-C
  • Lens selection
  • Higher effective ISO
Nikon D7100
Pentax K-3
  • $695
  • APS-C
  • Fast startup
  • Longer stills battery life
  • $699
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
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