The compact body of Pentax's Optio E90 is available in either black or red versions with silver metallic trim. The latest in the company's approachable Optio E-series of entry-level digital cameras, the Pentax E90 is based around a ten megapixel CCD that yields sensitivities as high as ISO 800 equivalent under automatic control, or 1,600 equivalent when controlled manually. The E90 places its imager behind a Pentax-branded 3x optical zoom lens with focal lengths ranging from a 31.5mm wide angle to a 94.5mm telephoto. On its rear panel, a 2.7-inch LCD display with 230,000 dot resolution is the sole choice on which images are framed and reviewed, with the Pentax E90 design not providing for a separate optical viewfinder.
The Optio E90 features three-point contrast detection autofocusing, as well as a face detection function that is linked to both the camera's autofocus and autoexposure systems. Pentax has included its approachable Auto Picture mode in the E90, which can automatically select between eight different common scene types - landscape, portrait, night scene, night scene portrait, standard, flower, sport or candlelight. The Pentax E90 also includes a digital panorama mode which can stitch together three images in-camera. An Image Recovery function can allow the user to "undelete" images where possible.
The Pentax E90 can capture 16-frame image bursts at a rate of eight frames per second, albeit at a reduced VGA (640 x 480 pixel) resolution. In addition, the E90 includes a VGA (640 x 480 pixel) standard definition video mode with sound, with a frame rate of 30 fps. The Pentax E90 also includes both a USB 2.0 high-speed data connection and NTSC / PAL standard-definition video output.
The Pentax Optio E90 includes a not-very-generous 6MB of built-in memory plus SD/SDHC card storage, and draws power from two AA batteries, with alkaline disposables included in the product bundle. Battery life is said to be in the region of 600 images from a pair of Lithium disposables. The Pentax E90 comes bundled with MediaImpression 2.0 for Pentax software. The camera ships from February 2010, priced at around US$100.