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17-50mm F2.8 XR Di II Aspherical Lens For Pentax DSLRs
A lightweight, compact, fast standard zoom lens. Designed for exclusive use with digital SLR cameras (APS-C Size) Lightweight, Compact Fast Standard Zoom Lens, Designed Exclusively for Digital SLR Cameras, with 17mm Wide Angle Coverage The lens covers virtually the same angle as focal lengths of 26-78mm when converted to a 35mm format. The wide-angle focal length is established at 17mm (26mm equivalent) to obtain a wider angle of view than ordinary standard zoom lenses. Since the lens is designed exclusively for APS-C sized digital cameras, the image circle diameter has been reduced. Optical System Uses Special Glass, and Is Optimized for Digital SLR Characteristics to Enhance Optical Quality in a Compact Design. The use of XR (Extra Refractive Index) glass optimizes the overall
distribution of optical power and also reduces various aberrations to the absolute minimum. In addition, two hybrid aspherical elements maintain imaging performance and help compress the entire optical system. Furthermore, an LD (Low Dispersion) glass element is used to accomplish effective compensation of on-axis and lateral chromatic aberrations. Minimum Focus Distance - The new lens achieves a minimum focus distance of 27cm over the entire zoom range, one of the best in its class among fast standard zoom lenses with an F/2.8 maximum aperture throughout the entire zoom range used exclusively for digital SLR cameras with APS-C sized image sensors. The maximum magnification ratio of 1:4.5*1 at the 50mm setting is the top level in its class. Optical Design Dedicated to Digital SLR
Photography This zoom lens uses an optical system designed to confine the changing angles of incidences of light rays reaching the imager within a certain scope over the entire image field by considering the effects of variance due to zooming. Enhanced Peripheral Illumination - Peripheral light fall-off is minimized when compared with that of conventional lenses for film cameras, so images are uniformly bright from the center to the periphery. Outstanding Resolution - Since the lens is designed exclusively for digital SLR photography, it provides high image quality resolution, contrast and flatness of image field.
distribution of optical power and also reduces various aberrations to the absolute minimum. In addition, two hybrid aspherical elements maintain imaging performance and help compress the entire optical system. Furthermore, an LD (Low Dispersion) glass element is used to accomplish effective compensation of on-axis and lateral chromatic aberrations. Minimum Focus Distance - The new lens achieves a minimum focus distance of 27cm over the entire zoom range, one of the best in its class among fast standard zoom lenses with an F/2.8 maximum aperture throughout the entire zoom range used exclusively for digital SLR cameras with APS-C sized image sensors. The maximum magnification ratio of 1:4.5*1 at the 50mm setting is the top level in its class. Optical Design Dedicated to Digital SLR
Photography This zoom lens uses an optical system designed to confine the changing angles of incidences of light rays reaching the imager within a certain scope over the entire image field by considering the effects of variance due to zooming. Enhanced Peripheral Illumination - Peripheral light fall-off is minimized when compared with that of conventional lenses for film cameras, so images are uniformly bright from the center to the periphery. Outstanding Resolution - Since the lens is designed exclusively for digital SLR photography, it provides high image quality resolution, contrast and flatness of image field.
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