Lens Lab
    SMC Pentax-M 35-70 mm f/ 2.8-3.5
    SMC Pentax-M 35-70 mm f/ 2.8-3.5

    SMC Pentax-M 35-70 mm f/ 2.8-3.5

    35–70mm · f/2.8–3.5

    Overview

    The SMC Pentax-M 35-70 mm f/2.8-3.5 is a vintage zoom lens with a constant f/2.8 aperture at the wide end, offering decent sharpness in the center but softer corners, especially at 35mm. Build quality is typical of the era: all-metal construction with a smooth focus ring, though the push-pull zoom mechanism can be prone to dust ingress. Chromatic aberration and flare are noticeable wide open. It suits photographers seeking a compact, fast standard zoom for film or adapted mirrorless use, provided they accept its optical limitations.