What is Di II ??
Lenses are designed for exclusive use on
digital cameras with smaller-size imagers and inherit all of the benefits of our
Di products. These lenses are not designed for 35mm film cameras and digital
cameras with image sensors larger than 24mm x 16mm.
At Tamron, our quest has always been to make the ideal zoom lens. As a result of
this ongoing challenge, we have introduced the concept of our high-power zoom
lens in the new AF18-200mm XR Di II for exclusive use with digital SLRs.
Tamron's original development of proprietary core technologies such as
Aspherical element production, Multiple Cam Mechanism and Integrated Focus Cam
design lend to the creation of the world's lightest, most compact 11.1X zoom
lens made for digital SLR cameras.
The 18-200mm (28-300 when converted
to 35mm) provides the digital photographer with the versatility of a true wide
to ultra tele zoom in an amazingly easy to use design.
Tamron's AF 18-200 mm F/3.5-6.3 XR Di-II LD
Aspherical (IF) Macro lens, designed exclusively for digital cameras with small
sensors, will ship in the spring. The wide to tele capabilities of this lens,
which is equivalent to 28 - 300 mm in 35 mm terms, means that you should seldom
need to change lenses. The lens, which is just 84mm long, features enhanced
peripheral illumination, minimizes peripheral light fall-off and its internal
surface coating reduces ghosting and flare. It is compatible with Canon AF,
Konica Minolta AF-D, Nikon AF-D and Pentax AF mounts.
The new AF18-200mm F/3.5-6.3 XR Di-II LD Aspherical (IF) MACRO is a high
power zoom lens designed for exclusive use with digital SLR cameras using
smaller-size imagers and inherits the product concept of the existing AF28-300mm
F/3.5-6.3 XR Di zoom lens. Even two years after its introduction, the AF28-300mm
XR is still a favorite and highly evaluated by photographers around the world as
a representative model of high power zoom lenses. With the recent market influx
of digital SLR cameras, the use of high power zoom lenses has become
increasingly popular since high power zooms provide the convenience of handling
many photographic scenes and the capability of shooting ultra telephoto shots
without changing lenses. The popularity of this focal length led Tamron to
initiate the development of new zoom lenses to further meet the needs of digital
SLR photographers. The result is the successful development of a new zoom lens
made exclusively for use on digital SLR cameras. The wide to ultra tele focal
range of this lens will allow digital SLR camera owners to enjoy digital
photography with comfort and convenience.
• "Di (Digitally Integrated design)-II" lenses are designed for exclusive
use on digital cameras with smaller-size imagers.
*This lens is not designed for use with 35mm film cameras and digital SLR
cameras with image sensors larger than 24mm x 16mm.
Main Features of Tamron AF 18-200 XR Di-II
Dedicated for Digital SLR Cameras
By incorporating an optical design for exclusive use with digital SLR
cameras with smaller-size imagers, this high power zoom lens provides the same
focal length, when converted to a 35mm format, equivalent to Tamron's 28-300mm.
Therefore, you can meet virtually every photographic opportunity with this
single zoom lens without changing lenses. When paired with the new ultra-wideangle
SP AF11-18mm zoom lens, simultaneously introduced by Tamron at Photokina 2004
and expected to ship in late spring 2005, you can thoroughly enjoy digital SLR
photography with the combined focal length coverage of 17-300mm.
Optical System Uses Special Glass and is
Optimized for Digital SLR Characteristics in order to Enhance Optical Quality in
a Compact Design
The new AF18-200mm high power zoom lens from Tamron features an entirely new
optical design using XR (Extra Refractive Index) glass in an innovative way in
order to optimize the overall distribution of optical power throughout the
entire zoom range. This design reduces various aberrations to the absolute
minimum and achieves remarkable downsizing at the same time. In addition, three
hybrid aspherical lens elements and two LD (Low Dispersion) glass elements are
used to accomplish effective compensation of on-axis and lateral chromatic
aberrations, a critical factor to enhance the optical quality in digital
photography. As a result, the lens provides outstanding optical quality in a
multi-purpose zoom lens.
Optical Design Dedicated to Digital SLR
Photography by Optimizing the Angles of Incidences of Light Rays Reaching the
The zoom lens uses a new optical system designed to confine the changing
angles of incidences of light rays reaching the imager within a certain scope
over the entire image field from the center to the periphery, by considering the
effects of variances due to zooming.
Enhanced Peripheral Illumination
Peripheral light fall-off is minimized when compared with that of
conventional lenses for film cameras so that images are uniformly bright from
the center to the periphery.
Since the lens is designed exclusively for digital SLR photography, it
provides high image quality in terms of resolution, contrast and flatness of
Internal Surface Coating to Reduce Ghosting and Flare
Ghosting and flare caused by aberrations are annoying factors in digital SLR
photography, so Tamron has adopted various countermeasures against the problem
including the employment of “Internal Surface Coatings” (i.e., multiple-layer
coatings on cemented surfaces of plural elements) and new multiple-layer coating
technology on ordinary elements in order to minimize reflections that occur when
light enters through the front element and to reduce image degrading effects
caused by the imagers themselves.
Revolutionary Minimum Focus Distance - 0.45m
(17.7") for 1:3.7* Macro Capability
It is an important condition for a multi-purpose zoom lens to provide the
capability of getting close to the subject. The new 18-200mm zoom lens realizes
an MFD (Minimum Focus Distance) of 0.45m (17.7") through the employment of a new
optical/mechanical design configuration. Since the maximum magnification ratio
at f=200mm is 1:3.7*, you can enjoy close-up photography easily and
* The Maximum Magnification Ratio of 18-200m (Model A014) is 1:3.7 while the
Maximum Magnification Ratio of the 28-300mm (Model A061) is 1:2.9. However, the
A014 can fill the frame with almost the same scope as the A061 does when
shooting with a 35mm SLR camera, since the new lens is exclusively designed for
digital SLR cameras with smaller-size imagers. The Maximum Magnification Ratio
of 1:3.7 is equivalent to 1:2.8 when converted to 35mm film format.
High Power, Yet Compact and Lightweight Thanks to New Mechanical Devices
Complicated mechanisms are built in the compact body thanks to new
mechanical devices. The lens is a multi-purpose zoom lens, yet excellent
portability and ease of use are assured. A number of invisible engineering
innovations required to downsize the lens, produce high precision parts and
increase durability are incorporated into the new AF18-200mm F/3.5-6.3 XR Di-II
LD Aspherical (IF) MACRO since manufacturing this type of zoom lens with such
complicated mechanisms inside was almost impossible with conventional
Zoom Lock Mechanism Incorporated
The Zoom Lock prevents unwanted barrel extension when carrying the
Flower-shaped Lens Hood
A glare-reducing flower-shaped lens hood is included as a standard
accessory. The special hood provides optimum shading of superfluous light rays
that enter from the rectangular frame outside the image field.
New External Design on the New Di-II Series Conveys “High Performance, High
Improvements have been made to the external design by adding a gold-colored
band between the focus and zoom rings to enhance the appearance and make it
stand out as a Di-II lens. The rubber patterns of the zoom and focus control
rings have been improved at the same time to compliment the digital camera
design style and to provide better handling.
Tamron AF 18-200mm XR DI-II f/3.5-6.3 LD Aspherical (IF) Macro
||18 - 200 mm
||F3.5 - 6.3
|Angle of view
||75° 33' - 7° 59'
||15 elements in 13 groups
|Minimum focus distance
||0.45 m (17.7 in)
|Maximum mag ratio
||1:3.7 (at f=200mm MFD 0.45m)
||84 mm (3.3 in) *
||f73.8 mm (2.9 in)
||398 g (14 oz) *
||Flower-shaped Lens Hood