Micro-Nikkor 55mm f/2.8 is a close-focusing lens with a large maximum aperture thus allowing brighter viewing and easier focusing in dim lighting or when coupled to extension rings or bellows unit. The lens employs Gauss-type optical design of six elements in five groups. The optical elements combines floating element system in the rear lens groups for enhanced performance. With the Micro 55mm excellent image quality at high magnification ratios, even at short distances are produced and distortion-correction remain virtually unchanged over the full focusing range.
Like many of Nikon's Nikkor lenses, this lens features air-to-glass Nikon Integrated Coating to provide enhanced image contrast and minimize flare and ghosting at wide apertures. Its 0.25 meters close focusing distance provides a 1:2 to 1:1 magnification ratio.