The symmetric 9-element, 7-group Biogon optical design with T* coating yields virtually zero geometric distortion and high contrast across the entire full-frame image, even wide open at f/2.8. Its compact 260g all-metal build and precise manual focus with a 0.5m minimum focus distance make it an unobtrusive, durable everyday carry lens. It is best suited for architectural and landscape photographers needing distortion-free precision, as well as street photographers who value a compact, discreet 25mm field of view.