The 5cm f/3.5 Micro-Nikkor lens for the Nikon rangefinder camera was introduced in May 1956. It has an aperture range of f/3.5 – f/22, an angle of view of 46°, 5 elements in four groups and a focusing range of 3ft (0.9m) to infinity (extended) or 1.5ft (0.45m) – 3ft (collapsed), however,it is not used for general photography in the collapsed mode; the filter size is 34.5mm and it weighs 4.8 ounces (145gm). The total production was 1,188 comprising of 901 in a bayonet mount and 287 in a Leica screw mount. Nikon used the same optical formula four years later for the reflex version of the Micro-Nikkor which is one of Nikon’s finest and most popular lenses, leading to a whole series of lenses right on up to the 200mm f/4 version.
The 5cm /3.5 Micro-Nikkor is available only in a chrome collapsible mount. Being an apochromatic lens it also has a high degree of colour correction, assuring precise focus of all prime colours on the film plane. When mounted on one of the Nikon copy stands, such as the SA or PA, with the lens in its extended position it can be used from 1/20 reduction to life-size. When the lens is collapsed it offers reduction ratios from 1/6 to 1/20.