Lens Lab
    Sigma APO Zoom 50-200mm f/3.5-4.5
    Sigma APO Zoom 50-200mm f/3.5-4.5

    Sigma APO Zoom 50-200mm f/3.5-4.5

    50–200mm · f/3.5–4.5

    Overview

    The Sigma APO Zoom 50-200mm f/3.5-4.5 is a rare 4x zoom from the mid-1980s, featuring apochromatic design with low-dispersion elements to reduce chromatic aberration. It has a built-in hood but a long minimum focus of 1.8m; an optional macro filter enables 1:2 reproduction at telephoto. Build mimics Canon L-series with a white finish and red stripe. Optical performance is sparsely documented, with limited sample images online. It suits enthusiasts or professionals seeking a vintage, collectible zoom with macro capability, though its rarity and lack of modern coatings may deter general use.