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The Canon PowerShot A640 couples a 10 megapixel CCD imager sensor with a 4x optical zoom lens that offers a 35mm-equivalent focal range of 35 to 140mm. That's a moderate wide-angle that reaches to a somewhat more generous telephoto than you'll find on most compact cameras. Maximum apertures vary from f/2.8 to f/4.1 across the zoom range. The A640's sensor yields an ISO range of 80 to 800, with shutter speeds of 1/2,500 to 15 seconds.
Designed with ease of use in mind, the Canon A640 offers both a range of features that make it approachable to beginners, as well as the ability to exert more control over the photographic process. For the former category of users, there's a fully automatic mode, and a generous selection of 13 Scene modes. For the latter, you'll find Manual, and Aperture/Shutter Priority exposures possible, plus preset, or manual White Balance, and three Metering modes. A VGA-or-below Movie mode captures videos at a maximum of 30 frames per second, for up to one hour (or one gigabyte) per clip.
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