Are you a professional photographer seeking to elevate your sports, wildlife, or nature photography The Sony Fe 400mm F2.8 Gm Oss Lens for Sony E-mount cameras is the answer. This super-telephoto prime lens, a result of Sony's extensive research and rigorous testing, delivers unparalleled image quality, extraordinary focusing speed, and precision. Weighing just over 6 lbs., this lens is the lightest in its class, offering unmatched portability and handheld maneuverability. This is achieved through an innovative optical design featuring three fluorite elements and a reduced number of elements at the front of the barrel. The use of durable magnesium alloy components further contributes to its lightweight design. This lens is not front-heavy, reducing the moment of inertia that resists rotation by up to 50% compared to the SAL500F40G.