- USD mechanism delivers precise and noiseless focusing at turbo speed;Focal Length 70 - 300mm ; Minimum Focus Distance 37.4" (.95 m).
- XLD (Extra Low Dispersion) lens element for sharper image contrast and definition.
- VC (Vibration Compensation) image stabilization.
- Perfect telephoto zoom choice for photographing sports, racing, or other fast-moving subjects.Dual format Di design for use on full frame and smaller sensor cameras.
- Maximum Magnification Ratio:1:4.
Precise descriptive performance
In the pursuit to achieve the most outstanding image resolution
in the 70-300mm class, Tamron’s Anniversary lens - the SP
AF70-300mm F4-5.6 Di VC USD - utilises an advanced optical design
that features a LD (Low Dispersion) and an XLD (Extra Low
Dispersion) lens element made from speed materials that
prevent chromatic aberration. As a result, the SP AF70-300mm
F4-5.6 Di VC USD boasts sharp contrast and great descriptive
performance.
In addition, it is the first Tamron lens to include a USD
(Ultrasonic Silent Drive), Tamron’s very own ultrasonic
auto-focus drive mechanism. This USD mechanism delivers fast
focusing, making it a perfect telephoto zoom choice for
photographing sports, racing, or other fast-moving subjects. The
lens also boasts Tamron’s proprietary VC (Vibration Compensation)
image stabilisation to assist in hand-held photography, not only
at long focal length ranges where blurring is common, but also
under low-lit conditions, dramatically enhancing photographic
freedom.This combination of best in class image resolution,
Ultrasonic Silent Drive and Vibration Compensation is a new
achievement of Tamron technology, culminating in the production
of a premium 70-300mm telephoto zoom lens.
Design Features
---------------
A new optical system optimised for digital SLRs achieves top
resolution in the 70-300mm class with speed glass elements.
The advanced optical design employs a sophisticated XLD (Extra
Low Dispersion) lens element made from a special high-grade glass
that has dispersive properties (i.e. where refraction causes the
dispersion of white light into spectral hues) even lower than
standard LD lenses. The dispersive properties of the XLD lens are
similar to those of fluorite; in combination with the LD
elements, these make for an optimal optical design that delivers
best-in-class resolution with advanced axial chromatic and
magnification aberration correction – major inhibitors of image
quality enhancement. The result is a lens that delivers sharp
contrast and better descriptive performance throughout the entire
zoom range. The lens also looks good as Tamron has adopted a
streamlined silhouette to ensure that the lens fits in with a
variety of SLR cameras. The subtle texture of the paint gives a
well-crafted finish to the exterior.
VC Off / VC On
Vibration Compensation (VC): Image Stabilisation
------------------------------------------------
The SP AF70-300mm F/4-5.6 Di VC USD employs Tamron’s excellent
image stabilisation mechanism – the VC (Vibration Compensation)
seen in both the AF18-270mm Di II VC (Model B003) and SP
AF17-50mm F/2.8 XR Di II VC (Model B005). With VC, the
photographer has the freedom to shoot at a shutter speed that is
an extra four stops slower without having to worry about image
blurring. This makes handheld capture of evening, night and
interior s much more spontaneous, as a sharp image can be
obtained more easily without having to the camera on a
tripod.
Full-Time Manual Focus
----------------------
Autofocus has many benefits but sometimes the photographer needs
the control of manual focus. Full-time manual offers just that:
the crossover from autofocus to manual focus by simply adjusting
the focus ring, allowing the photographer to make adjustments on
the fly. This feature helps the lens produce impressive results
even in telephoto situations where the depth of field is shallow.
Enjoyable Photography
---------------------
With a full-frame digital or 35mm SLR, portrait and medium
telephoto s can be achieved on the wider 70mm end of the
range and spectacular telephoto s at the longer 300mm. When
using an APS-C sensor camera the angle of view narrows, giving it
the equivalent range of 109-465mm* for bold ultra-telephoto
s. And with its maximum magnification ratio 1:4, the lens can
be used to explore the realm of semi-macro photography.
Uncompromising Countermeasures Reduce Ghosting and Flare
--------------------------------------------------------
Digital photography requires extreme precision, which is why
Tamron incorporates new BBAR (Broad-Band Anti Reflection)
multilayer coatings that reduce reflection into the lens
elements. This ensures excellent performance in all photographic
conditions and enhances light transmission on both long and short
wavelengths. Also, Tamron applies internal surface coatings on
cemented surfaces of lens elements to make images sharper with
better colour balance and reproduction.
Flower-Shaped Hood
------------------
Included as a standard accessory, the flower-shaped hood matches
the rectangular shape of the image sensor to most effectively
block the interference of superfluous light rays entering from
outside the borders of the image area, helping to ensure sharp,
clear, flare-free images with crisp detail in the shadow areas.
Super Performance
Super Performance for Discriminating Shooters (SP)
--------------------------------------------------
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.
Internal Focusing System (IF)
-----------------------------
Internal focusing provides numerous practical benefits to
photographers, including a non-rotating front filter ring that
facilitates the positioning of polarising and graduated filters,
and more predictable handling as 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 minimising illumination loss at
the corners of the image field, and helps to suppress other
aberrations that become more troublesome at different focusing
positions.
Ultrasonic Silent Drive
Ultrasonic Silent Drive (USD)
-----------------------------
Tamron’s USD works with the high-frequency ultrasonic vibrations
that are produced by a ring called a ‘stator’. Energy from the
vibrations is used to rotate an attached metallic ring known as
the ‘rotor’. Piezoelectric ceramic, an element that produces
ultrasonic vibrations when voltage of a specific frequency is
applied is arranged in a ring formation on the stator. This
electrode configuration of piezoelectric ceramic causes two
ultrasonic vibrations to occur in the stator.
By effectively combining these two ultrasonic vibrations, it is
possible to convert the energy from the vibrations that produced
simple motion into energy known as ‘deflective travelling waves’,
which then moves around the circumference (rotation direction) of
the ring. With the USD, the friction between these deflective
travelling waves created on the metallic surface of the stator
and the surface of the rotor produce force, causing the rotor to
rotate. The focusing ring lens, which is linked to the rotor, is
thus moved, creating a fast and smooth auto-focus drive.