A new Sony 100-400mm f/4.5 GM lens has been released, with some outlets suggesting it could be a significant development for sports and wildlife photography. The lens is described as a large zoom and is reported to gather more light than other 100-400mm lenses. Its release has generated interest, with one outlet noting it has quickly become a top-selling lens in Japan, although there is also speculation about the possibility of additional similar lenses being released.