Sony FE 400mm f/2.8 GM OSS – Premium Super-Telephoto Prime Lens. The Sony FE 400mm f/2.8 GM OSS (SEL400F28GM) is a high-performance G Master series super-telephoto prime lens for full-frame E-mount cameras, ideal for sports, wildlife, news, and nature photography. It offers outstanding image quality, lightning-fast autofocus, and a surprisingly lightweight design for its class. Technical Highlights: Focal length: 400mm (600mm equivalent on APS-C), extendable with 1.4x (560mm f/4) or 2.0x (800mm f/5.6) teleconverters with minimal loss of quality. Aperture: f/2.8 to f/22, with an 11-blade circular aperture for creamy, smooth bokeh, optimized for G Master quality. Optical design: 23 elements in 17 groups, including 3 Fluorite elements and 1 ED element to minimize chromatic aberrations. Nano AR coating reduces reflections and ghosting. Autofocus: Dual XD (Extreme Dynamic) linear motors for extremely fast, precise, and quiet AF, up to 5x faster than conventional systems, ideal for high-speed continuous shooting (e.g., 20 fps with the Alpha 9). Focus limiter (2.7–7 m or 7 m–∞) and full-time DMF for manual focus adjustments. Close focus: Minimum focusing distance of 2.7 m, maximum magnification of 0.16x, suitable for capturing finer details. Stabilization: Optical SteadyShot (OSS) with three modes (Standard, Pan, Dynamic Action), compatible with in-body image stabilization (IBIS) for sharp images. Design: Dust- and splash-proof magnesium alloy body (158.1 x 359 mm, 2,895 g) with fluorine coating on the front lens. Four focus hold buttons, function ring (for preset focus or APS-C/full-frame switching), AF/MF switch, and 40.5 mm drop-in filter drawer (including clear filter). Robust tripod base with 1/4"-20 and 3/8"-16 threads. Special Features: Image Quality: Exceptional corner-to-corner sharpness at f/2.8, with minimal aberrations and high contrast, ideal for high-resolution sensors (e.g., 50 MP Alpha 1). The bokeh is smooth and even, perfect for isolated subjects such as athletes or animals. Users praise: "Incredible sharpness and beautiful bokeh!" Handling: At 2,895 g, it's significantly lighter than competitors (e.g., Canon EF 400mm f/2.8L IS III, 3,850 g), with optimized weight distribution for handheld or monopod use. The rear focus group improves balance. Versatility: Ideal for sports (e.g., football, athletics), wildlife, and news photography. The f/2.8 aperture enables low-light shooting and shallow depth of field. Teleconverter compatibility extends the reach up to 800 mm without any significant loss of quality. Our service: We would be happy to let you experience the impressive performance of the Sony FE 400mm f/2.8 GM OSS for yourself. We can arrange a test lens for a limited trial period, accompanied by personalized advice to perfectly meet your needs. This lens is ideal for professionals seeking a fast, high-resolution super-telephoto lens with unsurpassed autofocus speed and mobility for demanding scenes.