Lens Lab
    Sigma 100-400mm F5-6.3
    Sigma 100-400mm F5-6.3

    Sigma 100-400mm F5-6.3

    100–400mm · f/5–6.3

    Overview

    The Sigma 100-400mm F5-6.3 offers strong value at ~$950, with good optical performance for its class, though RAW distortion and vignetting are notable. Build is lightweight plastic with basic weather sealing, and the dual-action zoom is convenient. Autofocus is fast and quiet. It suits budget-conscious wildlife/sports photographers seeking reach on APS-C, but lacks teleconverter compatibility and has a slower aperture than pricier rivals.