Pentax has designed its 14.6-megapixel K20D model to appeal to demanding photo enthusiasts but many of its features will also appeal to professional photographers. Like the earlier K10D model, the K20D is built to resist dust and moisture with seals protecting 74 different parts of the camera body. Physically the two cameras are similar, with identical body dimensions, although the new model has a larger LCD and is five grams heavier than its predecessor.
As with the K10D, the K20D's metal chassis is polycarbonate-clad. It's as well-balanced as its predecessor, with a large, but comfortable, grip that provides easy access to key shooting controls. The 2.7-inch monitor provides a worthwhile improvement but, otherwise the new model has a similar data LCD on the top panel and an identical set of controls on both top and rear panels. Both cameras record to SD or SDHC cards and the card and battery compartment doors lock very securely.
The body-integrated SR (Shake Reduction) mechanism is essentially identical to the system used in the K10D and relies on angular velocity sensors to detect camera shake. A ball-bearing-mounted oscillator unit with four electromagnets detects and counteracts motion by re-positioning the free-floating image sensor. Although the K20D's image sensor unit is lighter than its predecessor's and Pentax has refined the data-control algorithm to make the system more effective it still provides compensation of between 2.5 and four shutter speed steps with all existing Pentax interchangeable lenses.
The K20D supports the same shooting modes as its predecessor, with Program AE and manual exposure control plus priorities for aperture (Av), shutter speed (Tv), sensitivity (Sv) and a 'TAv' mode that lets photographers set both the aperture and shutter speed while the camera will adjust the ISO setting. ISO values are now included in the viewfinder display to assist users shooting in this mode. The standard Pentax 'green button' is provided for full-auto shooting and the same three-second Guide display appears each time you switch the camera on or change a mode to clarify current settings.
Margaret Brown
more : photoreview
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