• APS-C 369.7mm2
  • 16.2 megapixels
  • ISO 100 - 12,800
  • APS-C 372.1mm2
  • 16.3 megapixels
  • ISO 100 - 12,800

Buy From

Differences

Sony A55 advantages over Pentax K-5

  • In-camera panoramas
    Yes vs No
    Stitches multiple shots into a panoramic photo
  • Tiltable Screen
    Tiltable vs Fixed
    Tilt the screen for shooting flexbility
  • Built-in GPS
    GPS vs None
    Geotag your photos
  • Lighter weight
    727g vs 1003g
    Lighter weight
  • More viewfinder magnification
    0.73x vs 0.61x
    Get a bigger view of the scene through the eye-level viewfinder
  • More AF points
    15 vs 11
    More AF points improve autofocus
  • Faster JPEG shooting
    9.0 fps vs 6.5 fps
    Faster JPEG shooting (burst mode)

Pentax K-5 advantages over Sony A55

  • Lens selection
    Excellent vs Good
    Better lens selection gives you more options
  • Fast startup
    ~0.60 vs 0.9 sec
    Faster startup lets you catch the moment
  • Higher effective ISO
    1,162 vs 818 iso
    Take photos in low light with less noise
  • More dynamic range
    14.1 vs 12.4 evs
    Retain detail in highlight and shadows
  • Longer stills battery life
    More info 740 vs 330 shots
    Capture more photos
  • Top deck display
    Yes vs No
    Check settings with a screen on top of the camera
  • More cross-type AF points
    9 vs 3
    Cross-type AF points improve autofocus performance
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • Less shutter lag
    0.10 vs 0.22 sec
    Focus and take a photo quickly (wide angle)
  • 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

  • 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
  • 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

  • Focus peaking
    Neither provide
    Your camera will highlight what's in focus
  • 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
  • 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

  • Excellent high ISO performance, one of the best APS-C sensors yet; 6.5 fps burst mode has very good buffer depths; Weather, dust, and cold resistant; In-body Shake Reduction corrects not only horizontal / vertical, but also rotational motion.

  • Default saturation and contrast a bit high; Auto white balance too warm in tungsten light; Fewer AF points than main competitors; Only a single card slot, and no UHS-I card support (slow buffer clearing).

The Competition

Compared to Canon T2i

Sony A55
Canon T2i
  • $734
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization
  • $692
  • APS-C
  • Lens selection
  • Fast startup
Pentax K-5
Canon T2i
  • $774
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization
  • $692
  • APS-C
  • Fast startup
  • Shoots 24p video

Compared to Sony A33

Sony A55
Sony A33
  • $734
  • APS-C
  • Higher effective ISO
  • Built-in GPS
  • $540
  • APS-C
Pentax K-5
Sony A33
  • $774
  • APS-C
  • Lens selection
  • Fast startup
  • $540
  • APS-C
  • In-camera panoramas
  • Tiltable Screen

Compared to Nikon D7000

Sony A55
Nikon D7000
  • $734
  • APS-C
  • Less expensive
  • In-Camera Image Stabilization
  • $699
  • APS-C
  • Lens selection
  • Fast startup
Pentax K-5
Nikon D7000
  • $774
  • APS-C
  • In-Camera Image Stabilization
  • Less shutter lag
  • $699
  • APS-C
  • Fast startup
  • Longer stills battery life

Compared to Canon T3i

Sony A55
Canon T3i
  • $734
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization
  • $549
  • APS-C
  • Lens selection
  • Less expensive
Pentax K-5
Canon T3i
  • $774
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization
  • $549
  • APS-C
  • Tilt-swivel screen
  • More telephoto lens reach

Compared to Sony A35

Sony A55
Sony A35
  • $734
  • APS-C
  • Tiltable Screen
  • Built-in GPS
  • $567
  • APS-C
  • Less expensive
  • Longer stills battery life
Pentax K-5
Sony A35
  • $774
  • APS-C
  • Lens selection
  • Fast startup
  • $567
  • APS-C
  • In-camera panoramas
  • Lighter weight
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