After extensive research and development, Sony presents the FE 100-400mm f/4.5-5.6 GM OSS Lens, a flagship product in the G Master series. This high-quality, super-telephoto zoom lens offers a versatile focal length range, perfect for capturing sports, wildlife, and other distant subjects with extraordinary resolution and immediacy. The lens boasts an advanced optical design, featuring two ED (Extra-low Dispersion) glass elements and one Super ED glass element. These elements effectively suppress axial chromatic aberration, often a cause of resolution falloff in telephoto lenses, resulting in clear, well-defined images. Sony's innovative Nano AR Coating enhances clarity and contrast by suppressing reflections that can cause flare and ghosting in challenging lighting situations. This feature ensures consistently high contrast and clarity, providing greater framing and composing flexibility, especially in bright outdoor conditions. The lens is not only durable but also compact and lightweight, thanks to the use of magnesium alloy components. This design contributes to improved manageability with lightweight bodies for easier, more stable handheld shooting. The FE 100-400mm f/4.5-5.6 GM OSS Lens is the first in its class to include a zoom smoothness adjuster, providing mechanical control of zoom ring torque. This feature allows for fine adjustment of the lens to match individual user needs, offering a balance between fast zooming and slow, stable