Three screw fitting for up to 40mm lens mount. Rotating plate with eight apertures for 0.8cm-3.8cm in descending then ascending order of size. Operated by spring driven rackwork engaging gear on the plate shaft. Intended to clear softening effect in portraits. To be fitted on existing shutters or lenses. By rapid rotation of the perforated disc during exposure the light waves are so altered that the resulting negative has harsh lines softened, harsh lights subdued and softness and modelling automatically imparted to the image photographed. W. Tylar.c.1905