The Sony FE 100-400mm F4.5 GM OSS (SEL100400MC) is a super-telephoto zoom lens built for Sony E-mount full-frame cameras, designed for wildlife, bird, sports, photojournalism, and video applications. It features a constant F4.5 maximum aperture across the zoom range and an inner-zoom design that keeps the center of gravity stable during operation. An optional teleconverter extends reach to 800mm, making it a flexible option for shooters who need to cover a wide range of focal lengths from a single lens.
Optical construction includes an ED XA (Extra-low Dispersion extreme aspherical) element alongside XA, Super ED, and ED elements to control chromatic and spherical aberration throughout the zoom range. Four XD (extreme dynamic) Linear Motors drive the floating focus groups for fast, precise autofocus with improved tracking performance. Optical stabilization works in conjunction with Sony's in-body stabilization systems, and a customizable function ring can be assigned to Preset Focus, APS-C/Full Frame switching, or Power Focus. The magnesium alloy construction keeps weight to approximately 1,840g, and the lens features a dust and moisture resistant design with a fluorine-coated front element.
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