The Optio S55 features a smc Pentax 5.8-17.4mm 3x optical zoom with a 35mm equivalent focal length of 35.6 - 107mm, the maximum aperture is f2.6 - f4.8. The lens is all glass and consists of 6 elements in 5 groups with 2 dual-sided aspherical elements. When the camera is powered down the lens is retracted inside of the body and a built in shutter closes to protect the lens.

It has a 5-point AF system with user-selectable AF point location, Spot AF, infinity landscape and manual focus. The focusing range in Normal mode is 1.31 ft (0.4m) to Infinity; Macro mode: 7.1 inches (0.18 m) to 1.64 ft (0.5m); Super Macro mode: 2.4 inches (0.06m) to 7.9 inches (0.2m) at 10.2mm focal length.

The built in flash offers Auto, Flash-Off, Flash-On, Auto + red-eye reduction, Flash-On + red-eye reduction; Effective Range is 0.65ft - 11.5ft (0.2m - 3.5m) (5.8mm at ISO 200) and 0.65ft - 6.6ft (0.2m - 2m) (17.4mm at ISO 200).

On the top is the On/Off power button in the center of the Mode Dial which has positions for: Program AE, Digital Effects (Black and white, sepia, Red, Green, Blue, B&W + red, B&W + green, B&W + blue, 2 in 1, Panorama assist), Voice Recording, Movie, Night Portrait, Landscape, Portrait, Auto and Picture (Flower, Self-portrait, Surf, Snow, Sunset, Museum, Text, Food, Landscape Portrait, Marine, Marine movie.)

When you are shooting in the Auto mode you can get onscreen guidance on how to use the other modes by pressing the ?/Fn button.

On top is the zoom control, functions as the index/magnify control in playback. Below is the Playback button. The ?/Fn button as shown above can call up onscreen help when in the Auto record mode. When you're in other shooting modes the ?/Fn button calls up the onscreen Function menu to quickly change image size, quality or exposure compensation.

The 4-way controller lets you navigate menus and select images during playback. In record mode you press "Up" to enable remote, selftimer mode or drive mode, press left to change flash mode, press right to change focus mode (macro, infinity, manual focus and AF point select). The MENU button calls up and dismisses the menus, the DISPLAY button turns the color LCD on/off and controls the amount of data displayed on it.

The I/O ports:


The PC/AV port handles both the USB 1.1 connection for download and the audio-video output for TV display.




The DC IN jack is for the optional AC power adapter or an external battery pack.

The Optio S55 is equipped with 11MB of internal memory and has a Secure Digital (SD) card slot on the right side for optional memory cards. It's compatible with up to any size SD card. Data recorded on the internal memory can be copied to SD card.

The Optio S55 is powered by either one CR-V3 or two AA type batteries. This means you can use alkaline or photo lithium one-use AA, NiMH rechargeable AA cells or one-use CR-V3 lithium batteries (the latter being great for long shelf life and/or cold weather use.)