Three supplementary disks are supplied with the lens, and fit internally in the lens barrel. The three disks are labeled No.1 (5), No.2(5.6) and No.3 (6.3). The numbers in parentheses are the approximate f/stops to which the lens diaphragm, when set to f/4, is modified. The disks, numbered one, two and three, have different diameter holes in the center, surrounded by numerous smaller holes extending toward the edges of the disks. These small holes act like multiple diaphragms, overlaying softer images on top of the sharp image projected through the center hole. The overall level of sharpness is controlled by the diaphragm opening and choice of disk and whether or not a disk is used at all.
Sale : $800.00 Reg. $2688.00