Sigma 250–500mm f/6: The Super-Telephoto Zoom Redefined Published: July 2025 | Category: Gear NewsSigma’s latest patent (JP2025-102082) reveals a bold new direction for long-range photography: a 250–500mm f/6 telephoto zoom lens designed to be both compact and powerful. While Sigma is no stranger to super-telephoto optics—cue the legendary 200–500mm f/2.8 “green monster”—this new design emphasizes […]