Canon EOS
550D
 vs
Pentax
K-x

General

 Canon EOS 550D Pentax K-x
Brand
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 Canon Pentax
Lowest price
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 $691.01 $674.92
Announced
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 February, 2010 September, 2009

Sensor
Type
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 CMOS CMOS
Size
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 APS-C 22.3x14.9mm APS-C 23.6x15.8mm
Crop factor
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 1.6x 1.5x
Megapixels
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 17.9 MP 12.2 MP
Light sensitivity
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 6,400 ISO 6,400 ISO
Light sensitivity (boost)
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 12,800 ISO 12,800 ISO
Sensor cleaning
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 Yes Yes

Sensor (Advanced)
True resolution
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 17.9 MP 12.2 MP
Native resolution
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 5184 x 3456 4288 x 2848
Pixel size
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 18.5 µm² 30.5 µm²

Screen
Type
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 LCD LCD
Size
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 3.0" 2.7"
Resolution
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 1,040k dots 230k dots
Touch screen
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 No No
Flips out
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 No No
Live view
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 Yes Yes

Lenses
Lens availability
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 162 lenses 90 lenses
Lens focus motor
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 Yes Yes
Lens mount
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 Canon EF Pentax K

Form factor
Size
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 129x98x62 mm 123x92x68 mm
Depth
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 2.4" 2.7"
Weight
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 530 g 580 g
Interchangeable lenses
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 Yes Yes
Waterproof
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 No No
Weather sealed
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 No No

Viewfinder
Type
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 Pentamirror Pentamirror
Viewfinder size
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 0.54x 0.56x
Coverage
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 95% 96%

Movies
Format
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 1080p @ 30fps 720p @ 24fps
Supports 24p
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 Yes Yes
High-speed framerate
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 None None
External mic jack
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 Yes No
Autofocus
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 None None
All formats
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 1080p @ 24fps
720p @ 30fps
480p @ 25fps
720p @ 25fps
1080p @ 30fps
1080p @ 25fps
480p @ 30fps		 640 x 416 @ 24fps
720p @ 24fps

Features
Panorama
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 No No
HDR
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 No Yes
3D
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 No No
Image stabilization
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 None Sensor shift
Supports RAW
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 Yes Yes
GPS
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 No No

Performance
Startup delay
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 400 ms 600 ms
Shutter lag
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 252 ms 97 ms
Battery life
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 440 shots 420 shots
Continuous shooting
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 3.7 fps 4.7 fps

Focus system
Autofocus
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 Phase detection Phase detection
Focus points
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 9 11
Cross type focus points
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 1 9

Shutter
Max
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 1/4000s 1/6000s
Min
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 30s 30s

Flash
Built-in flash
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 Yes Yes
Popup
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 Yes Yes
External connection
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 Yes Yes

Storage
Storage slots
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 1 1
Supported formats
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 SDHC
SD
SDXC		 SD
SDHC

DXO Mark Scores
Image quality
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 66.0 72.0
Color depth
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 22.1 bits 22.8 bits
Dynamic range
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 11.5 EV 12.5 EV
Low light performance
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 784 ISO 811 ISO