Nikon AI-S Micro-Nikkor 55mm f/2.8 Manuel d'instruction - 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).