Mamiya Mamiya/Sekor 55mm F/1.8 Auto M42 Screw Mount Manual Focus Lens Review

The Mamiya/Sekor 55mm f/1.8 Auto is a vintage M42 screw-mount lens from the film era, now sold on the used market for around $60. It offers a classic normal focal length with a reasonably fast maximum aperture, making it a workable option for shooters looking to experiment with legacy glass on mirrorless cameras or classic 35mm bodies. The M42 mount is one of the most adaptable legacy standards, and this lens pairs well with modern adapters for Sony E, Fuji X, and Micro Four Thirds systems.

At this price point, the Mamiya/Sekor 55mm represents an affordable entry into manual focus shooting. The f/1.8 aperture provides modest low-light capability and shallow depth of field, though expectations should be tempered compared to modern optics. Build quality is typically solid for the era, with all-metal construction and smooth manual focus rings. Optical performance will vary with copy condition, but these lenses generally deliver acceptable sharpness in the center with some vintage character at the edges. Given the used nature and age, buyers should inspect carefully for fungus, haze, or separation.