Lens Lab
    Sigma AF 400 mm f/ 5.6 APO Macro /HSM
    Sigma AF 400 mm f/ 5.6 APO Macro /HSM

    Sigma AF 400 mm f/ 5.6 APO Macro /HSM

    400mm · f/5.6

    Overview

    The Sigma AF 400mm f/5.6 APO Macro/HSM is a discontinued telephoto prime offering high resolution, low vignetting, and negligible distortion and chromatic aberrations. It is sharp wide open and improves slightly when stopped down. Build quality is generally good, with a smooth, damped focus ring and a sturdy tripod collar, but the AF/MF switch and focus limiter feel loose. The lens is compact for its class at ~1.4 kg and features a built-in hood. It suits budget-conscious wildlife and sports photographers willing to buy used, but compatibility with modern DSLRs may be an issue.