Tamron Full Line Catalog - page 22-23

of advantages. They’re smaller and lighter and
also provide faster and quieter operation than
DC motors for improved AF performance.
Compared with their predecessors, their actuator
system allows far greater flexibility in lens design,
reducing the overall size and weight of the lens.
Regular
Optical Glass
AD glass
Possesses a relatively
uniform partial
dispersion ratio.
Extremely large partial
dispersion ratio relative to
a specific wavelength zone
The difference in partial dispersion factors between normal optical
glass and AD glass elements (typical diagram)
Image plane
Image plane
Regular
Optical Glass
LD glass
The difference in chromatic aberration between normal optical glass
and LD glass elements (typical diagram)
*PZD is loaded on B008 (18-270mm).
ZL
Zoom Lock (ZL) Feature
Another original Tamron mechanical engineering
concept is the Zoom Lock ( ZL ), a simple
convenience feature that prevents undesired
extension (creep) of the lens barrel when carrying
the camera / lens unit on a neck strap. This
enhances responsiveness in the field and helps
protect the lens.
AD
Anomalous Dispersion (AD)
For Better Color Correction
Anomalous dispersion (AD) glass is a special
type of optical glass that is used to achieve more
precise control of chromatic aberrations, thereby
enhancing overall imaging performance. Glass
of this type provides an abnormally large
partial dispersion ratio (amount of diffraction)
for light of specific wavelength ranges (colors)
within the visible spectrum. By combining AD
glass having these special characteristics with
elements made of normal glass having different
dispersion characteristics, it is possible to
LD
Low Dispersion (LD) Glass
For Greater Lens Sharpness
XLD (Extra Low Dispersion) lens
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 low dispersion
index, has less of a tendency to separate
(diffract) 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 (toward the edges of the field ) that
often occurs at short focal lengths (the wide-
angle end of the zoom range).
Ultrasonic Silent Drive (USD) is an ingeniously
upgraded auto-focus-drive system developed
by Tamron to deliver the extraordinary auto-
focusing (AF) speed and precision needed
to capture every nuance high-speed sports
action, along with virtually noiseless operation
as required for discreet picture taking. Based
on advanced motor technology and newly
developed software, it employs a piezoelectric
ceramic element to generate two high-frequency
ultrasonic vibrations on the motor’s stator ring.
This in turn causes the adjacent metallic rotor
to rotate by means of deflective traveling waves
when voltage of a specific frequency is applied.
This advanced electronically controlled auto-
focus system is linked to a precision focusing
helical that moves the lens to the precise focus
point. The result: A remarkable new level of AF
speed, accuracy, smoothness, and silence.
*USD is loaded on A005 (70-300mm).
Extra Low Dispersion( XLD) lens elements made
from specialized ultra-high-grade glass allow
Tamron lens designers to achieve much greater
control over chromatic aberration (color fringing)
and magnification aberrations, the two major
factors that inhibit image quality enhancement.
In combination with LD elements, XLD elements
are used to achieve sophisticated lenses that
deliver the highest possible contrast, the finest
detail, and superior imaging performance
throughout the entire zoom range.
Advanced BBAR lens coating technology:
The Key to attaining the highest image quality
IF
Internal Focusing (IF) System
Piezo Drive
Ultrasonic Silent Drive
Internal focusing (IF) 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 (vignetting), and helps
to suppress other aberrations that become more
troublesome at different focusing positions.
An exclusive Tamron innovation, PZD is an
advanced ultrasonic, autofocus (AF) motor based
on the latest piezoelectric technology—the
standing wave principle. It utilizes high-frequency
voltage to turn a ceramic piezoelectric element
with a swiveling motion, causing the metal tip
at the rotor’s contact point to rotate elliptically,
thereby turning the rotor to focus the lens swiftly,
silently, and with great precision.
Standing wave ultrasonic motors like the one
used in Tamron’s innovative PZD have a number
Tamron uses advanced multi-coating techniques
to suppress reflections and light dispersion on
lens element surfaces that result in reduced
light transmission and may, under adverse
conditions, cause flare and ghost images that
reduce contrast and can diminish image quality.
The BBAR (Broad-Band, Anti-Reflection)
multiple-layer coating technique also helps to
provide the best possible color balance for
vibrant and accurate color rendition. Tamron
has developed an improved proprietary version
of BBAR multi-coating that successfully
increases light transmission in both longer and
shorter wavelengths, and has applied it to all
the latest Tamron lenses.
control the dispersion factors of a specific
wavelength. This enhanced level of control results
much lower levels of on-axis (central) chromatic
aberration for telephoto lenses (or zooms used
at telephoto settings) and a significant reduction
of lateral (peripheral) chromatic aberration for
wide-angle lenses (or zooms used at wide-
angle settings).
XLD
*Some models are not available for all
mounts. Please check the specifications on
the page 27 for mount availability.
*Di-II Lens Series does not have aperture rings.
Tamron’s quality assurance and envi-
ronmental protection activities
ISO Standards
ISO stands for the International Organization for
Standardization. These international standards include
the ISO 9000 family of standards relating to quality
system management, and the ISO 14000 series for
certification of environmental management systems.
Certification of environment and quality control are also
being applied to all Tamron.
Environment
Tamron has been assertively addressing concerns
about the earth's environment through the reduction
of environmental load in business operations based
on the ISO 14001. Specifically, Tamron has promoted
the “Green Procurement” policy for abrogating harmful
substances from the beginning and reinforcing
positive environmental programs. At Tamron, we have
addressed such issues as energy savings and waste
reduction and recycling for reducing environmental
loads generated from the manufacture of products.
Such activities promote the development of high
quality, compact and environmentally friendly products
to satisfy customers. In addition, from 2004, Tamron
issued Environmental Reports to introduce its socially
responsible philosophy and practices for environmental
preservation. For further details, please visit Tamron's
website at
html
ISO 9001 Quality Control Policy
Provide customer satisfaction by delivering high quality
products.
ISO 14001 Environmental Management
Philosophy
In accordance with its corporate management
philosophy, Tamron's goal is to create and deliver
superior quality products and services tomeet customer
needs. Furthermore, each Tamron employee is fully
committed to the preservation of the global environment
at every level and for each facet of company activities.
At Tamron, we recognize the significance of our social
responsibilities.
ISO 14001 the Fundamentals
of the Environmental Conservation Policy
1,
Compliance with legislation relevant to
environmental conservation
2,
Conservation and protection of natural resources
3,
Prevention of environmental contamination
4,
Continued promotion of an environmental
conservation program
5,
Promote design philosophy and development of
environmentally friendly products to contribute to
environmental protection.
6,
Promote environmental education
7,
Disclosure of environmental-related information to
the public
The manufacture of compact, high quality, high-
power zoom lenses became a reality only when
Tamron perfected a lens chassis that permitted
stable and smooth extension of the lens barrel.
The “Multiple Cam Zoom Mechanism” is an
original Tamron design that incorporates several
precision cams cut into a single cylindrical
surface by high-tech automated machinery.
This key component enables zoom lens barrels
to be extended and retracted effortlessly,
achieving commendably compact dimensions
at the wide-angle settings, while holding precise
extension at telephoto settings.
Multiple-Cam Mechanism For
Smooth, Stable Zooming and
Precise Focusing at All Focal Lengths
Integrated Focus Cam Design For
Optimizing Internal Focusing
Tamron’s Integrated Focus Cam is a precision
mechanical component that optimizes the
coordinated movement of the Internal Focusing
(IF) system with the Multiple-Cam Zoom
Mechanism. This ingenious Focus Cam is
designed to insure seamless and precise
positioning of all the highly sophisticated internal
elements within the lens and coordinate them
with the convenient external zoom and focus
controls that comprise the user interface.
Designed to Fit AF Cameras from
Major Camera Makers
Engineering Plastics Technology
To insure the highest levels of performance and
durabilitywithout adding additional weight, Tamron
High-Power Zoom Lenses make extensive use of
engineering plastic materials in many critical
mechanical components of the lens. Tamron has
developed advanced proprietary methods for
manufacturing these advanced polycarbonate
materials to a very high degree of precision, and
repeated tests have confirmed their long-lasting
properties and dimensional stability under the
toughest conditions. Indeed, polycarbonate of
this caliber is the material of choice whenever
we produce high-precision components that
require the strength to withstand rigorous use.
Sophisticated Tamron
Production Technology
Tamron manufacturing processes are certified to
demanding ISO 9001 standards, an internationally
recognized proof of the most thorough quality
control. Tamron’s high-power zoom lenses come
out of a factory that is well known for delivering
on its world-class capabilities, and is widely
respected for its unwavering policy of delivering
excellent quality products that meet the total
satisfaction of its valued customers.
The Filter Effect Control is designed to rotate
the filter to the desired position with the hood
attached, enabling you to simultaneously perform
minute adjustments to PL filter compensation.
You can confirm the
Polarizing effect through
the viewfinder, all while
using the hood to
prevent harmful light
from entering the lens.
The Detachable Filter Effect Control
Tamron’s AF lenses fit AF models by four major
camera makers. Please be sure to select the
appropriate mount for your camera.
For Canon AF
For Nikon AF
For Pentax AF
For Sony AF
Auto-focus/Manual focus (AF/MF)
Switch Mechanism on the Focus Ring
The ability to switch quickly between auto-focus
(AF) and manual focus (MF) is a great asset in
many types of shooting, especially sports and
nature photography. This is easily accomplished
with Tamron’s ingenious AF/MF system. By
simply sliding the focus ring back and forth
between the two positions you can select either
the AF or the MF focusing position. In manual-
focus mode Tamron lenses provide smooth,
precise manual focusing by turning their wide,
well-textured focusing rings.
AFMF
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