Sigma 50-100mm f/1.8 DC HSM Art Lens for Nikon F

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Features F-Mount Lens/DX Format 75-150mm (35mm Equivalent) Aperture Range: f/1.8 to f/16 Four SLD Elements, Three FLD Elements One High-Refractive Index Element Super Multi-Layer Coating Hyper Sonic Motor AF System Fixed, Rotating Tripod Collar Rounded 9-Blade Diaphragm This Nikon F-mount Sigma 50-100mm f/1.8 DC HSM is an Art-series zoom mixing impressive versatility with advanced optics. The bright f/1.8 constant maximum aperture offers consistent low-light performance throughout the zoom range