Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) with Built-In AF Motor for Nikon Digital SLR Cameras (Model A09NII)

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Product Overview

• Style: Nikon
• Set: US Version
• Maximum Aperture: f/2.8
• Focal Length: 28-75mm
• Focus Type: Auto
• Brand: Tamron
• Type: Aspherical
• Mount: Nikon

From the Manufacturer This ground-breaking high-speed mid-range zoom is prized
by pros and serious shooters for its fast F/2.8 constant aperture, evenness of
illumination, and its outstanding imaging performance, and by all
photographers for its compact size and reasonable weight that make it feel
like an ordinary standard zoom. These admirable characteristics have been
achieved by the use of special XR and LD glass, the efficient use of
aspherical elements, and non-rotating internal-focus (IF) design. This
remarkable zoom lens also focuses down to 0.33m (13”) (1:3.9 magnification) at
all focal lengths for satisfying close-up performance and is compatible with
APS-C and full-frame-format SLRs. Not surprisingly it is widely acclaimed as a
classic. Worlds smallest & lightest lens The most compact and lightest in the
history of fast zoom lenses. Thanks to the revolutionary downsizing "XR"
technology employed by Tamron in the development of high-power zoom lenses
such as the 28-200mm and 28-300mm, the dramatic compactness that makes this
lens the world's smallest and lightest is achieved. Its compactness makes it
look and feel like an ordinary standard zoom lens, yet the versatility that a
fast constant maximum aperture offers will definitely reshape your
photographic horizons. SP AF28-75mm F/2.8 XR Di Features Digitally Integrated
(DI) Lenses for the Best Imaging Performance Di (Digitally Integrated Design)
is a Tamron designation that applies to lenses that have been optimized for
digital capture using advanced multi-coating techniques and optical designs
that assure excellent image quality across the entire picture field. Because
of these characteristics, Di lenses provide outstanding performance on cameras
with full-frame and APS-C format sensors as well as on 35mm film. Low
Dispersion (LD) Glass for Greater Lens Sharpness Low Dispersion (LD) glass
reduces chromatic aberration Low dispersion (LD) glass elements in a lens help
reduce chromatic aberration; the tendency of light of different colors to come
to different points of focus at the image plane. Chromatic aberration reduces
the sharpness of an image, but glass with an extremely lowdispersion index,
has less of a tendency to separate (defract) a ray of light into a rainbow of
colors. This characteristic allows the lens designer to effectively compensate
for chromatic aberration at the center of the field (on axis), a particular
problem at long focal lengths (the telephoto end of the zoom range), and for
lateral chromatic aberration (towards the edges of the field) that often
occurs at short focal lengths (the wide-angle end of the zoom range.) Super
Performance (SP) for Discriminating Shooters Tamron SP (Super Performance)
series is a line of ultra-high-performance lenses designed and manufactured to
the exacting specifications demanded by professionals and others who require
the highest possible image quality. In creating SP lenses Tamron’s optical
designers put their foremost priority on achieving superior performance
parameters—they are all designed to a higher standard with little regard for
cost constraints. As a result, Tamron lenses bearing the SP designation
feature impressive and innovative designs that have established an enviable
reputation for excellence among those knowledgeable photographers that demand
the very best. Extra Refractive Index Glass (XR) Special glass for better
performance and more compact lens designs Extra Refractive Index (XR) glass
can bend light rays at steeper angles, thereby decreasing the physical length
of the lens while enhancing imaging performance by minimizing optical
aberrations. This has allowed Tamron to develop a line of shorter, smaller-
diameter, lighter lenses without sacrificing lens speed, and actually
upgrading image quality compared to older designs. XR glass is costlier than
conventional glass but it yields enhanced optical power distribution, making
possible many of the outstanding and innovative lens designs that bear the XR
designation. XR glass, with its superior light-bending power, makes it
possible to design a short-barrel lens with the same light-gathering ability
(aperture value) as a long-barrel lens—even with a smaller lens diameter. By
using this principle Tamron has been able to shorten the length of the entire
optical system and produce lighter, more compact lenses of the same speed, and
also to provide greater zoom ranges in lenses that are much more convenient to
carry by hand. Internal Focusing (IF) System Internal focusing provides
numerous practical benefits to photographers including a non-rotating front
filter ring that facilitates the positioning of polarizing and graduated
filters, and more predictable handling because the lens length does not change
during focusing. Even more important, Tamron’s Internal Focusing (IF) system
provides a much closer minimum focusing distance (MFD) throughout its entire
focusing range. In addition, IF improves optical performance by minimizing
illumination loss at the corners of the image field, and helps to suppress
other aberrations that become more troublesome at different focusing
positions. Aspherical Lens Elements (ASL) Aspherical Lens Element Tamron uses
several hybrid Aspherical lens elements in many lenses bearing the Aspherical
designation. These innovative optics allow us to achieve the ultimate in image
quality, and at the same time produce lenses that offer remarkable zoom ranges
in extraordinarily compact packages. By perfecting theses cutting-edge
advances for series production, Tamron has advanced the state of optical
design, and virtually eliminated spherical aberration and image distortion
from the high-power-zoom series.Through the effective application of Hybrid
Aspherical Technology, one lens element can take the place of multiple
elements without compromising performance. This is what allows us to produce
remarkably compact long-range lenses that deliver a uniformly high level of
image quality at all focal lengths and apertures. Zoom Lock (ZL) Another
original Tamron mechanical engineering concept is the Zoom Lock (ZL), a simple
convenience feature that prevents undesired extension of the lens barrel when
carrying the camera/lens unit on a neck strap.