Lens Lab
    Sigma 100-400mm F5-6.3 DG DN OS
    Sigma 100-400mm F5-6.3 DG DN OS

    Sigma 100-400mm F5-6.3 DG DN OS

    100–400mm · f/5–6.3

    Overview

    The Sigma 100-400mm F5-6.3 DG DN OS is a lightweight, affordable telephoto zoom for full-frame and APS-C mirrorless systems, offering good value at around $950. Optical strengths include sharpness and effective stabilization (5 stops on Fuji X-mount), but weaknesses include a variable aperture and lack of included tripod collar. Build quality is solid with polycarbonate and metal construction, though weather sealing is limited to a mount gasket. It suits budget-conscious wildlife, sports, and birding photographers who prioritize portability and cost savings over premium features.