Style Name:Pentax DSLR Cameras Product Description FLD (“F” Low Dispersion) glass elements FLD glass is the highest level low dispersion glass available with extremely high light transmission. This optical glass has a performance equal to fluorite glass which has a low refractive index and low dispersion compared to current optical glass. It also benefits from high anomalous dispersion. These characteristics give excellent correction for residual chromatic aberration (secondary spectrum) which cannot be corrected by ordinary optical glass and ensures high definition and high contrast images. This lens incorporates two FLD glass elements, which compensate for colour aberration. In addition, two glass mold elements and one hybrid aspherical lens give excellent correction for field curvature and astigmatism. High definition images are ensured throughout the entire zoom range .Sigma’s unique Large aperture throughout the entire zoom range The large F2.8 aperture allows the use of fast shutter speeds and provides a bright viewfinder image, helping the photographer confirm accurate focusing. It is also ideal for emphasizing the subject by creating a natural, blurred background. .Covering a wide range of focal lengths This lens covers a wide range of focal lengths from 17mm and has an equivalent angle of view of a 25.5-75mm with a 35mm SLR camera. It is ideal for general photography as well as portraits and landscapes. Compact construction The lens has a compact construction with a diameter of 83.5mm, overall length of 91.8mm and weight of 565g. This compact and lightweight construction makes it ideal for travel photography. .Super Multi-Layer Coating and superior peripheral brightness The Super Multi-Layer Coating reduces flare and ghosting as well as providing sharp and high contrast images throughout the entire zoom range. This lens also benefits from superior peripheral brightness and provides sharp and high contrast images even at the maximum apertures. .Fast and quiet AF with internal focusing The lens incorporates HSM (Hyper Sonic motor), ensuring fast and quiet AF. The inner focusing system eliminates front lens ration, making the lens particularly suitable for using the supplied petal-type hood and circular polarising filters. .Close focusing capability This lens has a minimum focusing distance of 28cm throughout the entire zoom range and a maximum magnification ratio of 1:5. .Rounded diaphragm This lens has rounded 7 blade diaphragm which creates an attractive bokeh to the out of focus area of the image. Box Contains 17-50mm f/2.8 EX DC HSMLens HoodFitted Padded CaseFront and Rear CapsInstruction Manual1 Year Warranty Card
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