Lens Lab
    Mamiya Sekor SX 55 mm f/ 1.8 Auto
    Mamiya Sekor SX 55 mm f/ 1.8 Auto

    Mamiya Sekor SX 55 mm f/ 1.8 Auto

    55mm · f/1.8

    Overview

    The Mamiya Sekor SX 55mm f/1.8 is a 1970s all-metal manual lens with solid build and precise focusing. Optically, it offers excellent edge quality, outstanding contrast, and very good astigmatic correction, with slight curvature of field and negligible coma (Lens Legend quoting bench test). Wide open it is usable and sharp, with good performance from f/1.8 to f/2.8. The SX version has a different M42 mount with a pin that complicates adapter use. It produces warm tones, gentle contrast, and smooth bokeh. Best for photographers seeking a characterful, affordable vintage lens for film or adapted digital use.