The FUJIFILM X-mount 100-400mm f/5-6.3 DG DN OS Contemporary lens, from Sigma, is a versatile telephoto zoom mixing a hand-holdable design with apt optical performance. A series of low-dispersion glass elements are used to achieve high clarity and color accuracy throughout the zoom range and to suppress chromatic aberrations and color fringing. Additionally, four-stop-effective optical image stabilization helps to reduce the appearance of camera shake for sharper handheld shooting and this 100-400mm is also compatible with the optional TS-111 Tripod Socket for steady shooting atop a tripod or monopod. Telephoto zoom is designed for FUJIFILM X-mount mirrorless cameras, where it provides a 150-600mm equivalent focal length range. One F Low Dispersion (FLD) element and four Special Low Dispersion (SLD) elements markedly reduce chromatic aberrations and color fringing throughout the zoom range for improved clarity and color accuracy. The integrated stepping motor realizes quick and quiet autofocus, which is further complemented by an optimized AF algorithm to produce a smoother focusing performance.

At the 100mm end of the zoom range, a minimum focusing distance of 3.7' is available, and at the 400mm end, the minimum focusing distance is 5.2' with a maximum magnification of 1:4.1.Integrated AFL button can be programmed to adjust various shooting settings and the lens also features a focus limiter switch for faster-focusing performance within certain distance ranges. Brass bayonet affords improved mounting accuracy and rigidity, and rubber sealing is incorporated in the mount's design to render it dust- and splash-resistant. Compatible with an optional TS-111 Tripod Socket for working atop a tripod or monopod; the included PT-31 Protective Cover can be attached to the lens to maintain a seamless appearance if the tripod socket is not used.