A simple lens for enlarging up to 6 x 6cm-format film, the Beseler 75mm f/3.5 Enlarging Lens features a Leica M39/39mm threaded mount and includes a jam nut for mounting to lens boards for use. The optical design is comprised of coated and color-corrected glass for accurate results and the aperture ring features click stops for easier, more intuitive setting of aperture size when working in a darkroom.