Lens Lab
    Nikon Nikkor 20 mm f/ 4
    Nikon Nikkor 20 mm f/ 4

    Nikon Nikkor 20 mm f/ 4

    20mm · f/4

    Overview

    The Nikon Nikkor 20mm f/4 is a compact, manual-focus ultrawide lens (1974-1978) praised for its small size and light weight (7.4 oz). Optically, the center is sharp from f/5.6, but corners improve significantly at f/8 or smaller; avoid f/16 due to diffraction. Build quality is excellent with smooth focusing and a durable design. It suits landscape and infrared photographers who appreciate manual focus and compactness, but is less ideal for action or DX cameras.