• APS-C 369.7mm2
  • 24.3 megapixels
  • ISO 100 - 16,000
  • APS-C 366.6mm2
  • 20.1 megapixels
  • ISO 100 - 51,200

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Differences

Sony A77 advantages over Pentax K-S1

  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • 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
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • More viewfinder magnification
    0.73x vs 0.63x
    Get a bigger view of the scene through the eye-level viewfinder
  • More pixels
    24.3 vs 20.1 megapixels
    Higher resolution photos
  • More AF points
    19 vs 11
    More AF points improve autofocus
  • Wider angle kit lens
    24 mm vs 27 mm
    Capture more of the scene with the included lens
  • Faster JPEG shooting
    11.6 fps vs 5.4 fps
    Faster JPEG shooting (burst mode)

Pentax K-S1 advantages over Sony A77

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Higher effective ISO
    1,061 vs 801 iso
    Take photos in low light with less noise
  • Lighter weight
    765g vs 1363g
    Lighter weight
  • Optional anti-aliasing filter
    Optional vs Fixed
    Lets you choose sharper photos or reduced moiré
  • Higher extended ISO
    51200 vs 16000 ISO
    Higher extended ISO can give more low-light flexibility

Similarities

Common Strengths

  • Focus peaking
    Both provide
    Your camera will highlight what's in focus
  • Eye-level viewfinder
    Both provide
    You'll be able to frame photos even when the sun is out
  • In-Camera Image Stabilization
    Both provide
    Reduces the effects of camera shake at slower shutter speeds
  • 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
  • On-sensor phase detect
    Neither provide
    Usually improves live view and video AF performance
  • 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

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Buy the Sony A77
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  • Body Only
  • Kit with 16-50mm Lens
  • Kit with 18-135mm Lens
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Buy the Pentax K-S1
Body Only
  • Body Only
  • Kit with 18-55mm and 50-200mm Lenses
All K-S1 Deals

Review Excerpt

  • 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.

  • Read our Sony A77 Full Review

The Competition

Compared to Canon 7D

Sony A77
Canon 7D
  • $1899
  • APS-C
  • Tilt-swivel screen
  • Focus peaking
  • $1499
  • APS-C
  • Lens selection
  • Less expensive

Compare Sony A77 vs Canon 7D

Pentax K-S1
Canon 7D
  • $502
  • APS-C
  • Focus peaking
  • Larger sensor
  • $1499
  • APS-C
  • Longer stills battery life
  • More telephoto lens reach

Compare Pentax K-S1 vs Canon 7D

Compared to Sony A58

Sony A77
Sony A58
  • $1899
  • APS-C
  • Tilt-swivel screen
  • Fast startup
  • $598
  • APS-C
  • Longer stills battery life
  • Lighter weight

Compare Sony A77 vs Sony A58

Pentax K-S1
Sony A58
  • $502
  • APS-C
  • Lens selection
  • Higher effective ISO
  • $598
  • APS-C
  • Less expensive
  • In-camera panoramas

Compare Pentax K-S1 vs Sony A58

Compared to Canon 70D

Sony A77
Canon 70D
  • $1899
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1149
  • APS-C
  • Lens selection
  • Less expensive

Compare Sony A77 vs Canon 70D

Pentax K-S1
Canon 70D
  • $502
  • APS-C
  • Focus peaking
  • In-Camera Image Stabilization
  • $1149
  • APS-C
  • Tilt-swivel screen
  • Touchscreen

Compare Pentax K-S1 vs Canon 70D

Compared to Sony A77 II

Sony A77
Sony A77 II
  • $1899
  • APS-C
  • Built-in GPS
  • $1198
  • APS-C
  • Built-in Wi-Fi
  • NFC

Compare Sony A77 vs Sony A77 II

Pentax K-S1
Sony A77 II
  • $502
  • APS-C
  • Lens selection
  • Lighter weight
  • $1198
  • APS-C
  • Tilt-swivel screen
  • In-camera panoramas

Compare Pentax K-S1 vs Sony A77 II

Compared to Pentax K-S2

Sony A77
Pentax K-S2
  • $1899
  • APS-C
  • In-camera panoramas
  • Built-in GPS
  • $499
  • APS-C
  • Lens selection
  • Built-in Wi-Fi

Compare Sony A77 vs Pentax K-S2

Pentax K-S1
Pentax K-S2
  • $502
  • APS-C
  • Higher-res screen
  • $499
  • APS-C
  • Tilt-swivel screen
  • Built-in Wi-Fi

Compare Pentax K-S1 vs Pentax K-S2

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