The main features that differentiate the S5n from its nearest neighbours are a 2in 110,000 pixel LCD monitor, an AF low-light illuminator, and the lack of an optical viewfinder. Apart from these it is physically almost identical to the S5i, S4i, S4 and S. It has a strong aluminium alloy body with a distinctive milled pattern of concentric circles on the front panel, giving it an easy to grip feel. This is similar to the finish of the four cameras listed above, but the pattern is finer, which unfortunately means it is also more prone to marks and scratches.

Specifications

 More information :  Announced 13-Feb-05
 Max resolution   :   2560 x 1920
 Low resolution  :    2304 x 1728, 2048 x 1536, 1600 x 1200, 1024 x 768, 640 x 480
 Image ratio w:h   :   4:3
 Effective pixels  :    4.9 million
 Sensor photo detectors   :   5.3 million
 Sensor size  :    1/2.5 "
 Sensor type  :    CCD
 Colour filter array   :   RGB
 Sensor manufacturer    :  Unknown
 ISO rating  :    Auto, 80, 100, 200, 400
 Zoom wide (W)  :    35.6 mm
 Zoom tele (T)  :    107 mm (3 x)
 Digital zoom  :    Yes, 4 x
 Image stabilization  :    No
 Auto Focus   :   Yes
 Manual Focus   :   Yes
 Auto focus type  :    TTL
 Normal focus range   :   40 cm
 Macro focus range  :    6 cm
 White balance override  :    5 positions, plus manual one-touch
 Aperture range   :   F2.6 - F4.8 / ??
 Min shutter  :    4 sec
 Max shutter  :    1/2000 sec
 Built-in Flash     : Yes
 Flash guide no.   :   3.5 m (11.4 ft) 5 m
 External flash  :    No
 Flash modes   :   Auto, On, Off, Red-eye reduction
 Exposure compensation   :   -2 EV to +2 EV in 1/3 EV steps
 Metering  :    Multi-segment, Center weighted, Spot
 Aperture priority   :   No
 Shutter priority  :    No
 Focal length multiplier       
 Lens thread   :   No
 Continuous Drive   :   Yes
 Movie Clips   :   Yes, 640 x 480, 30 fps, audio, unlimited
 Remote control   :   No
 Tripod mount   :   Yes
 Self-timer   :   Yes
 Timelapse recording  :    No
 Orientation sensor   :   No
 Storage types  :    SD/MMC card + Internal
 Storage included   :   9.3 MB Internal
 Uncompressed format  :    No
 Compressed format  :    JPEG (EXIF 2.2)
 Quality Levels   :   Normal, Fine, Superfine
 Viewfinder   :   No
 LCD   :   2.0 "
 LCD Pixels   :   110,000
 Video out   :   Yes
 USB    :  Yes
 Firewire (IEEE 1394)   :   No
 Battery / Charger   :   Yes
 Battery   :   Lithium-Ion rechargeable
 Weight (inc. batteries)   :   120 g (4.2 oz)
 Dimensions    :  84 x 52 x 21 mm (3.3 x 2 x 0.8 in)

Review

Pentax has utilised its proprietary Sliding Lens System to create the 3x zoom lens Optio S5n, which is just 20.5 mm wide. The addition to the S-series has been designed to fit in with Pentax's concept of 'being stylish and ultra-compact enough to be worn like an accessory'. Spec wise it can capture VGA-quality movie clips which can be played back on the 2.0-inch LCD. The Optio S5n comes with a stand which charges spare batteries and those in the camera.
http://www.dpreview.com/