• APS-C 368.2mm2
  • 14.6 megapixels
  • ISO 100 - 3200
  • APS-C 332.3mm2
  • 18.0 megapixels
  • ISO 100 - 6400

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Differences

Pentax K20D advantages over Canon T3i

  • Larger sensor
    APS-C 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
    ~ 5.05 vs 4.30 microns
    Better low-light and dynamic range (all else equal)
  • Fast startup
    ~0.40 vs 1.5 sec
    Faster startup lets you catch the moment
  • Longer stills battery life
    More info 530 vs 440 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 1
    Cross-type AF points improve autofocus performance
  • Pentaprism viewfinder
    Pentaprism vs Pentamirror
    Much better viewfinder picture fidelity
  • Less shutter lag
    0.17 vs 0.28 sec
    Focus and take a photo quickly (wide angle)
  • More viewfinder magnification
    0.63x vs 0.53x
    Get a bigger view of the scene through the eye-level viewfinder
  • Bigger JPEG buffer
    38 vs 9 shots
    Take more JPEG shots before waiting (burst mode)

Canon T3i advantages over Pentax K20D

  • Less expensive
    $600 vs $800 (MSRP)
    Save money for lenses or accessories
  • Tilt-swivel screen
    Tilt-swivel vs none
    Tilt and swivel the screen for maximum shooting flexibility
  • Higher effective ISO
    793 vs 639 iso
    Take photos in low light with less noise
  • External Mic Jack
    Jack vs No jack
    Improved sound fidelity when shooting video
  • HDMI out
    HDMI out vs None
    Use HDMI output to monitor or review video
  • Shoots 24p video
    Yes vs No
    Gives your movies a big-screen feel
  • More dots on screen
    1040k vs 230k dots
    Can mean greater resolution or a brighter screen
  • Shoots 1080p video
    Yes vs No
    You'll want this if you shoot video
  • More pixels
    18.0 vs 14.6 megapixels
    Higher resolution photos
  • Shoots 60p video
    Yes vs No
    A faster framerate can give you more editing options
  • Faster JPEG shooting
    3.6 fps vs 2.8 fps
    Faster JPEG shooting (burst mode)
  • Higher extended ISO
    12800 vs 6400 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
  • Internal flash
    Both provide
    Useful in a pinch for fill flash
  • 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
  • In-camera panoramas
    Neither provide
    Stitches multiple shots into a panoramic photo
  • 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
  • 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

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Buy the Pentax K20D

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Buy the Canon T3i

Review Excerpt

  • Excellent image quality; Good grip; Full HD video recording; Swiveling LCD; Very fast autofocus; HDMI output.

  • Slow frame rate for sports shooting; Tendency to overexpose in bright sunlight; Live View AF is slow; No microfocus adjustment.

  • Read our Canon T3i Full Review

The Competition

Compared to Samsung GX-20

Pentax K20D
Samsung GX-20
  • $800
  • APS-C
  • Less expensive
  • $1400
  • APS-C
  • Higher effective ISO

Compare Pentax K20D vs Samsung GX-20

Canon T3i
Samsung GX-20
  • $549
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $1400
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization

Compare Canon T3i vs Samsung GX-20

Compared to Sony DSLR-A380

Pentax K20D
Sony DSLR-A380
  • $800
  • APS-C
  • Lens selection
  • Fast startup
  • $849
  • APS-C
  • Tiltable Screen
  • HDMI out

Compare Pentax K20D vs Sony DSLR-A380

Canon T3i
Sony DSLR-A380
  • $549
  • APS-C
  • Lens selection
  • Less expensive
  • $849
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization

Compare Canon T3i vs Sony DSLR-A380

Compared to Pentax K-7

Pentax K20D
Pentax K-7
  • $800
  • APS-C
  • Less expensive
  • Fast startup
  • $1300
  • APS-C
  • Longer stills battery life
  • HDMI out

Compare Pentax K20D vs Pentax K-7

Canon T3i
Pentax K-7
  • $549
  • APS-C
  • Less expensive
  • Tilt-swivel screen
  • $1300
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization

Compare Canon T3i vs Pentax K-7

Compared to Pentax K-5

Pentax K20D
Pentax K-5
  • $800
  • APS-C
  • Fast startup
  • $800
  • APS-C
  • Higher effective ISO
  • More dynamic range

Compare Pentax K20D vs Pentax K-5

Canon T3i
Pentax K-5
  • $549
  • APS-C
  • Tilt-swivel screen
  • More telephoto lens reach
  • $800
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization

Compare Canon T3i vs Pentax K-5

Compared to Canon T4i

Pentax K20D
Canon T4i
  • $800
  • APS-C
  • Larger sensor
  • In-Camera Image Stabilization
  • $579
  • APS-C
  • Tilt-swivel screen
  • Touchscreen

Compare Pentax K20D vs Canon T4i

Canon T3i
Canon T4i
  • $549
  • APS-C
  • $579
  • APS-C
  • Touchscreen
  • Fast startup

Compare Canon T3i vs Canon T4i

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