Nikon 55MM F/2B Instruction Manual - Page 14

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FOREWORD

An updated version of Nikon's reknown close-focusing lens, the

Micro-Nikkor 55mm f/2.8 features a larger maximum aperture. Thus,

the image in the viewfinder is brighter and it's easier to focus when

the light gets dim or extension rings or a bellows unit are attached.

It has a modified Gauss-type optical design of six elements in five

groups and incorporates a floating element system in the rear lens

group for improved performance. In fact, this lens produces excel-

lent image quality at high magnification ratios as well as normal

shooting distances, because definition and distortion-correction

remain virtually unchanged over the entire focusing range. Nikon's

multilayer coating on air-to-glass surfaces also provides significant

gain in image contrast and minimum flare at wide apertures. With a

built-in dual-helical system, the Micro-Nikkor 55mm f/2.8 focuses

continuously from infinity down to a reproduction ratio of 1:2

with the lens focusing, ring. And by attaching the optional PK-13

Ring or TC-201 Teleconverter, it goes from 1/2 reproduction ratio

down to 1:1 (lifesize).