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The Pentax Optio A40 is an attractive twelve megapixel camera with an SMC Pentax-branded 3x optical zoom lens, and a 2.5" LCD display. Offering a higher than average resolution of 232,000 pixels, this LCD is the only method of framing images since the A40 forgoes any form of optical viewfinder.

The Pentax A40 has a fairly typical 35mm-equivalent focal range of 37 - 111mm, with a maximum aperture that varies from f/2.8 to f/5.4 across the zoom range, and is stabilized using sensor shift shake reduction, as well as the company's Digital SR mode. ISO sensitivity is from 50 to 1600 (3200 in Digital SR mode, at 5 megapixels), and the A40 includes both Shutter-priority and Manual exposure modes, plus a generous 14 scene modes in addition to full Auto and Program exposure modes. The A40 offers shutter speeds ranging from 1/2000 to 4 seconds, Multi-segment, Center-weighted and Spot metering modes, and +/- 2.0EV of exposure compensation. Autofocus is performed by a 5-point TTL contrast detection system, including spot, tracking and face recognition modes. The A40's movie mode captures VGA resolution (640 x 480 pixels) video at 30 frames-per-second using DivX (MPEG-4) encoded AVI files with sound.

Optio A40 connectivity includes both high-speed USB 2.0 and NTSC / PAL video, and images are stored on Secure Digital / MultiMediaCards, including newer SDHC types, plus 21MB of built-in memory. The Pentax A40 derives its power from a proprietary Lithium-ion battery pack or optional AC adapter.

The Pentax Optio A40 ships from October 2007, priced at about US$300.