 | Pentax K-x | Sony Alpha 550 |
|---|---|---|
| Resolution | 12.9 Megapixel | 14.2 Megapixel |
| Sensor size | 23.6x15.8mm | 23.4x15.6mm |
| Sensor type | CMOS | CMOS |
| Digital zoom | No | No |
| Built-in flash | Yes | Yes |
| Video out | Yes | Yes |
| Video recording | Yes | No |
| File formats | JPEG, RAW, RAW - JPEG | JPEG, RAW, RAW - JPEG |
| USB port | USB 2.0 Hi-Speed | USB 2.0 Hi-Speed |
| Firewire port | No | No |
| White balance | Auto, Cloudy, Daylight, Flash, Fluorescent, Manual, Shade, Tungsten | Auto, Cloudy, Daylight, Flash, Fluorescent, Incandescent, Manual, Sunny, User Set Color Temperature |
| Self-timer | Yes | Yes |
| Bluetooth | No | No |
| Weight | 515 g | 599 g |
| Dimensions | 122.5x91.5x67 mm | 137x104x84 mm |
| Storage | SDHC, Secure Digital | Memory Stick Pro, Memory Stick Pro Duo, SDHC, Secure Digital |
| Battery | 4x AA | Li-Ion |
| Minimum shutter speed | Bulb+30 sec | 30 sec |
| Maximum shutter speed | 1/6000 sec | 1/4000 sec |
| Continuous shooting | 4.7 fps | 5 fps |
| Maximum resolution | 4288x2428 pixels | 4592x3056 pixels |
| Minimum resolution | 1728x1152 pixels | 2288x1520 pixels |
| Focal length multiplier | 1.5 | 1.5 |
| Auto focus | Yes | Yes |
| Manual focus | Yes | Yes |
| Flash modes | anti red-eye, auto, fill in, off, slow flash | anti red-eye, auto, fill in, off, slow flash |
| Aperture priority | Yes | Yes |
| Shutter priority | Yes | Yes |
| External flash | Yes | Yes |
| External flash type | Hot-shoe | Hot-shoe |
| Exposure compensation | -3EV - +3EV with 1/2 or 1/3EV steps | -3EV - +3EV with 1/2 or 1/3EV steps |
| Video sound | Yes | No |
| Frames per second (fps) | 24 | 0 |
| Voice recording | Yes | No |
| Optical viewfinder | Yes | Yes |
| Electronic viewfinder | No | No |
| LCD size | 2.7-inch | 3-inch |
| LCD monitor | Yes | Yes |
| Metering modes | Center weighted, Multi-segment, Spot | Center weighted, Multi-segment, Spot |
| ISO ratings (light sensitivity) | auto, 100 - 12800 | auto, 200 - 12800 |
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