Tamron Full Line Catalog - page 20-21

Tamron Lens Technology
The Inside Edge: Innovative Ideas In Pursuit Of Optical Perfection
For over half a century Tamron has been recognized as a leading innovator in cutting-edge optical design, and
acclaimed for its mastery of the underlying mechanical and electronic technologies that make today’s amazing
lenses possible. Developing practical, compact, easy-to-use lightweight zoom lenses with incredible zoom ranges,
apertures and close focusing ability, that also deliver world-class imaging performance, is not simply a matter of
refining existing ideas—it entails creative thinking at the highest level. Here is a definitive list that explains each of the
original proprietary design concepts used in today’s state-of-the-art Tamron lenses.
barrel (side view)
barrel (rear view)
long barrel
(optics)
short barrel
(optics)
VC (Vibration Compensation) Unit Structure [for Model A20]
Di
Digitally Integrated Lenses
For Top 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.
Di II
Digitally Integrated Lenses
Optimized For APS-C Format
Digital SLR Cameras
Di II is the designation Tamron applies to
lenses designed for exclusive use on digital
SLR cameras with APS-C format image
sensors. All Di II lenses are optimized to
meet the performance characteristics of this
popular class of cameras, providing maximum
resolution concentrated within the image field
and assuring that light rays at the edges of the
frame reach the sensor at favorable angles,
thereby minimizing peripheral light falloff. In
addition, all lenses bearing this designation
incorporate effective measures to increase light
transmission and eliminate ghosting and flare,
which are particularly noticeable with digital
cameras. Tamron’s advanced multi-coatings
are applied not only to external and internal
lens surfaces, but also to surfaces in between
cemented lens elements. Finally, Di II lenses are
offered in a wide array that includes the focal
length ranges most desired by DSLR shooters.
SP
Super Performance 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.
Introducing "VC" - Tamron's Unique
Vibration Compensation Mechanism
Tamron's unique VC ( Vibration Compensation)
mechanism uses a proprietary actuator and
algorithms to deliver an extremely stable viewfinder
imagewith excellent tracking. Themechanismuses
a three-coil system to electromagnetically drive the
lens element that compensates for vibration, which
glides smoothly on three steel bearings with little
friction. This simple mechanical structure is one of
the secrets to Tamron's compact lenses.
*VC is loaded on B005(17-50mm), B008(18-270mm),A20(28-300mm)
and A005(70-300mm/except Sony mount).
Special Glass For Better
Performance And More Compact
Lens Designs
XR (Extra Refractive Index ) 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
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 and hand-hold.
ASL
Hybrid Aspherical Elements
Provide the Ultimate in
Image Quality and Compactness
More compact lenses with the same speed:
It’s all in the barrel
Tamron uses several hybrid aspherical lens
elements in the 18-250mm, 17-50mm VC,
17-50mm, 28-75mm, 28-300mm ( XR Di and
VC ) and other 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 these 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.
Image plane
Image plane
Compensation for Spherical Aberration
Spherical lens element
Aspherical lens element
Image plane
Distortion Correction (Barrel type)
Aspherical
Surface
Spherical Surface
The correctedheightof
incident light rays at the
image plane
Theuncorrectedheight
of incident light rays
through a spherical
lenselement
Unbalanced height of oblique incident
light rays causes distortion at the image
plane. Tamron's aspherical lens design
continuously varies the refracting angles
of these unbalanced light rays.
Compensation effect with an aspherical lens element
(schematic illustration)
OFF
ON
Focal length: 300mm Exposure: F/9 at 1/30 sec
Taken under the same conditions using a vibrating table
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