Sigma 750975 100-400mm X Mount Telephoto Lens

The Sigma 100-400mm F5-6.3 DG DN OS (Model 750975) for Fujifilm X Mount brings long-range telephoto capability to the Fujifilm mirrorless system in a package that prioritizes portability without sacrificing optical quality. As a native X Mount lens, it communicates seamlessly with Fujifilm X-series bodies for full autofocus performance, in-camera corrections, and EXIF data recording. The built-in optical stabilizer (OS) system is essential at these focal lengths, counteracting hand shake to help photographers achieve sharp results when shooting handheld—whether tracking birds in flight, capturing action at a sporting event, or photographing distant landscapes.

Sigma's engineers have paid close attention to optical performance, incorporating specialized coatings and element designs to minimize flare and ghosting that can plague telephoto lenses in backlit or high-contrast scenarios. On the Fujifilm APS-C sensor, this lens provides a 35mm equivalent field of view of roughly 150-600mm, delivering extraordinary reach that opens up creative possibilities for photographers who previously had limited native telephoto options on the X Mount system. The compact form factor makes it a practical travel companion and a lens that can stay in the bag without weighing down a kit, ready for opportunities that demand serious reach.