SIGMA APO 50-150mm F2.8 EX DC Lens (Pentax mount)

Compact, lightweight, large aperture telephoto zoom lens designed exclusively for digital SLR cameras and incorporating the very latest optical technology.The Sigma Corporation is pleased to announce the launch of the new APO 50-150mm F2.8 EX DC lens.Specially designed for digital SLR cameras with an APS-C size image sensor, this large aperture F2.8 lens has a compact and lightweight construction of 76.3mm (3.0") in diameter, 132.6mm (5.2") in length and weighing just 780g (27.5oz) (Nikon Mount).The incorporation of the very latest optical technology gives optimum lens performance providing excellent correction for flare, ghosting and all types of aberrations. High image quality is assured throughout the entire zoom range. Four SLD (Special Low Dispersion) glass elements are used for utmost correction of chromatic aberrations.The HSM (Hyper Sonic Motor) system ensures quiet and high-speed auto focusing with full time manual focus override.The addition of the 1.4x EX DG APO or 2x EX DG APO Tele Converters (optional extras) produces a 70-210mm F4 AF tele-zoom lens and a 100-300mm F5.6 AF ultra-telephoto zoom lens respectively.Features:Lens Construction: 18 Elements in 14 GroupsAngle of View: 27.9 ° - 9.5 °Number of Diaphragm Blades: 9 BladesMinimum Aperture: F22Minimum Focusing Distance: 100cm (39.4 inches)Maximum Magnification: 1 : 5.3Filter Size: Diameter 67mmLens Hood: Bayonet TypeDimensions: Diameter 76.3mm X Length 135.1mm (3.0 inches x 5.3 inches)Weight: 770g/27.2 oz.