4x optical zoom
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The new Pentax 17-70 SDM has an approximately 4.1-times zoom ratio covering from wide-angle to moderate-telephoto ranges : when mounted on a Pentax digital SLR camera body, this zoom lens offers the focal-length range from 26mm wide angle to 107mm telephoto in the 35mm format. It offers the most frequently used focal lengths in day-to-day photography.
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SDM autofocus system
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Thanks to the incorporation of the Pentax SDM system driven by a built-in supersonic motor, this zoom lens offers exceptionally smooth, quiet autofocusing operation. The focus mode is automatically switched to SDM-assisted autofocusing. Because this zoom lens has been developed exclusively for SDM-assisted autofocusing, it is designed compact and maneuverable despite the incorporation of the built-in supersonic motor. But pay attention : this lens is compatible with the K20D, K200D, K100D Super and K10D (with Ver. 1.30 or later firmware installed) camera bodies. When mounted on other camera bodies, the focus mode is automatically switched to manual.
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Optical quality and aperture
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Incorporating two hybrid aspherical (AL) optical elements in its optics, this zoom lens assures optimal image quality, while compensating various aberrations. From lens coating and curvature to the positioning of optical elements, the optics has been designed to optimize the lens's digital imaging characteristics. The image circle is proportioned to the camera's image-sensor size. It offers a maximum aperture of F4 over the entire zoom.
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