| Manufacturer | Pentax |
| Name | Optio S45 |
| Image sensor | 1/2.5in, 4.0 MP effective |
| Max output resolution | 2304 x 1728 |
| Other resolutions | 1600 x 1200, 1024 x 768, 640 x 480 |
| Zoom | 3x (optical), 2.6x (digital) |
| Optical focal length (35mm) | 5.8-17.4 mm (approx 35.6 to 107mm) |
| Maximum lens aperture | f2.6-4.8 |
| Shutter speeds | 1/2000 sec. to 4 sec |
| ISO rating | Auto/50/100/200/400 |
| LCD screen | 2.5in TFT LCD, 115,000 pixels |
| Viewfinder | N/A |
| Flash range | Approx 4.9m |
| Flash modes | Auto flash, flash on, flash off, red-eye reduction |
| Exposure control | Programmed AE, EV compensation |
| Exposure metering | TTL Multi segment, centre-weighted or spot metering |
| Exposure Compensation | ±2 EV in 1/3 EV steps |
| White balance modes | Automatic, Daylight, Shade, Tungsten, Fluorescent and Manual |
| Auto-Focus | TTL 5-Point Auto Focus, Spot AF |
| Manual focus | Yes |
| Macro focus distance | 6cm |
| Recording Modes | Single, continuous |
| Image formats | JPEG, MPEG1 |
| Compression | Good, Better, Best |
| Picture Adjustments | Contrast, saturation, sharpness |
| Video (max res/format) | 320 x 240 pixels with audio and 30fps |
| Movie Length | Upto card capacity |
| Self-timer | 10 seconds |
| Memory card slot | Secure Digital |
| Supplied Memory | 11MB internal, no card supplied |
| Batteries supplied | 2x AA alkaline |
| Recharger supplied | No |
| A/V output | PAL and NTSC |
| Ports | USB 1.1/AV |
| Accessories | Wrist strap, Software CD, USB cable, mains cable, charger |
| Dimensions (W x H x D) | 89 (w) x 58.5 (h) x 27.5 (d) mm |
| Weight (Body Only) | 135g |
| Software | Pentax Software S-SW32, ACDSee |
| Warranty | 12 Months |
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