Sigma 736110 50-500mm Telephoto Zoom Lens for Sigma SLRAchieve Extreme Reach with Unparalleled Versatility The Sigma 50 500mm f 4 6. 3 EX DG HSM APO RF Telephoto Zoom Lens is designed for Sigma SLR cameras, offering a remarkable 10x zoom ratio and exceptional image quality. This high magnification ultra telephoto zoom lens is perfect for capturing distant subjects with clarity and precision. Brand: Sigma Focal Length: 50 500mm Aperture: f 4 6. 3 Mount: Sigma SLR Cameras Optical Design: Optimized for