| Manufacturer | Pentax |
| Name | Optio S55 |
| Image sensor | 1/2.5 inch CCD with 5.25 million pixels |
| Max output resolution | 2560 x 1920 |
| Other resolutions | 2304 x 1728, 2048 x 1536, 1600 x 1200, 1024 x 768, 640 x 480 |
| Zoom | 3x (optical), 4X (digital) |
| Optical focal length (35mm) | 5.8-17.4 mm (35.6 - 107mm) |
| Maximum lens aperture | f/ 2.6 - f/ 4.8 |
| Shutter speeds | 4 sec - 1/2000th second |
| ISO rating | Auto/80/100/200/400 |
| LCD screen | 2.5" TFT LCD, 110,000 pixels |
| Viewfinder | None |
| Flash range | 3.5m |
| Flash modes | Auto, Red-Eye reduction, Slow, Flash on, Flash off, Slow synchro |
| Exposure control | Auto, Portrait, Sports/Action, Night Scene, Landscape, Flowers, Self-portrait, Sunset, Text, Beach/snow |
| Exposure metering | Matrix, Spot, Center-weighted |
| Exposure Compensation | ± 2 Ev with 1/3 Ev step |
| White balance modes | Automatic, Daylight, Tungsten, Fluorescent, Cloudy, Shade, Flash, Custom |
| Auto-Focus | AF Wide, AF Narrow |
| Manual focus | Yes |
| Macro focus distance | 6cm |
| Recording Modes | Single, Continuous, Self-timer, Remote control |
| Image formats | JPEG, MPEG-4 AVI with Audio, DCF2.0 compliant, DPOF, PIM3, Exif 2.2 |
| Compression | Good, Better , Best |
| Picture Adjustments | Saturation, Contrast, Sharpness, Filters, Colour effects |
| Video (max res/format) | 320x240, 30fps with sound. |
| Movie Length | Up to card capacity |
| Self-timer | 10 seconds/2 seconds |
| Memory card slot | Secure Digital |
| Supplied Memory | 16MB |
| Batteries supplied | 2x AA |
| Recharger supplied | Yes |
| A/V output | PAL and NTSC |
| Ports | USB/AV, DC in |
| Accessories | Wrist strap, Software CD, charger cradle, |
| Dimensions (W x H x D) | 89 x 58.5 x 27.5mm |
| Weight (Body Only) | 135g |
| Software | ACDSee, Windows Media Player, Win98 USB driver |
| Warranty | 24 Months |
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