The FE 600mm f/4 GM OSS Lens from Sony is designed for their E-mount cameras and is ideal for sports, news, wildlife, and nature photographers. The f/4 aperture and eleven-blade circular diaphragm provide great depth of field control for isolating subjects, as well as maximizing performance for low-light shooting situations. The front element is further protected by a fluorine coating that helps prevent dirt and fingerprints from sticking while making it easier to wipe clean if they do become attached to the lens surface. Complementing that is Sony's XD (Extreme Dynamic) Linear Motor autofocus system, which is driven by two motors to quickly and quietly track subjects across the frame, even while shooting at high speeds. Furthermore, Optical SteadyShot can combine with in-body stabilization to provide 5-axis stabilization. The magnesium alloy body of this lens is also dust- and moisture-resistant for protection while shooting in adverse conditions. A fixed tripod collar employs bearings to ensure smooth rotation, with a switch to engage or disengage click stops. When engaged, users can switch between horizontal and vertical orientations in 90° increments as required.

The improved design of this well-balanced lens reduces the number of elements deployed at the front of the barrel, resulting in faster, more precise panning, whether shooting handheld or on a monopod. The XD Linear Motors deliver improved levels of fast, precise, and quiet autofocus operation, and also contributes to reliable and tenacious AF tracking that sports and wildlife photographers will appreciate. Additionally, an algorithm developed specifically for the XD motors improves their response, minimizing lag and instability that can occur when driving a large aperture focus lens group, resulting in quiet, low-vibration operation. The optical design includes a large aperture XA (extreme aspherical) element and three fluorite elements that help to minimize axial chromatic aberration which can be a problem in large-aperture lenses, as well as lateral chromatic aberration that can reduce resolution towards the image periphery. Color bleeding is effectively suppressed, allowing clear reproduction of the finest subject details, while Sony's original Nano AR coating suppresses any unwanted reflections, glare, or ghosting. Extremely high resolution is maintained right out to the image edges. Spherical aberration is optimized to create a strong balance between high resolution and soft, beautiful bokeh through careful control at both the design and manufacturing stages. Each lens is individually tested and adjusted to achieve these characteristics. When changing your aperture to defocus the background, the areas out of the focal plane appear blurred.

This 'bokeh' effect of the blurred background can be enhanced with the circular aperture blades used in this lens. Optional high-performance 1.4x and 2.0x teleconverters are supported, providing up to a 1200mm focal length, or up to an 1800mm equivalent on APS-C bodies. Outstanding imaging performance and fast, precise AF operations are maintained when either of these teleconverters is used, ensuring that the lens' G Master image quality is not compromised. The maximum aperture with the 1.4x and 2.0x teleconverter is f/5.6 and f/8, respectively. The focus range limit switch allows a limited focus range to be selected when the fastest possible focusing is required. Three settings are provided: FULL, 49-15' / 15-4.5m, and Infinity-49' / 15m.