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Here's a copy of the official Tamron press release:
Tamron AF 55-200mm Di II LD Macro lens : Tamron have
announced the Tamron AF 55-200mm F/4-5.6 Di II macro LD, a tele-zoom designed
exclusively for digital SLR cameras with smaller-size image sensors that will be
available at an affordable price. For photographers who bought their digital SLR
camera in a kit with a standard zoom lens but are dissatisfied with the telephoto
capability of the standard lens, the AF 55-200mm Di II LD Macro lens offers in a
second lens a desirable telephoto range at an affordable price. The new tele-zoom
from Tamron will allow these photographers to enjoy the telephoto capabilities
that yield dynamic images in many photographic situations including sporting
events, large wildlife, scenery and portraiture.
D-SLR lens
This is a telephoto zoom for exclusive use on digital SLR cameras that covers the
focal length range equivalent to 85-310mm when converted to a 35mm format. The
lens will allow D-SLR owners fitted with standard zoom lenses to enjoy with ease
the professional-looking “pulling” and “compression”
effects particular to telephoto lenses. Since the optical system is designed for
exclusive use on digital cameras, the image circle is smaller, resulting in a
compact package measuring 83.0mm (3.3”), accepting a 52mm standard filter
and weighing a mere 295 g.
Macro and Out-of-Focus
The new Tamron 55-200mm zoom lens realizes an MFD (Minimum Focus Distance) of
0.95m (37.4”) over the entire zoom range, the top level of the closest
focusing distance among tele-zoom lenses. Since the maximum magnification ratio
at f=200mm is 1:3.5, you can enjoy easy and convenient close-up photography. The
Maximum Magnification Ratio of 1:3.5 is equivalent to 1:2.3 when converted to
35mm film format. Since the lens employs a nine-blade almost circular diaphragm
construction, it provides naturally blurred background effects when a natural
out-of-focus effect is desired. Such effects are done by using the shallow depth
of field of a telephoto lens or in close-up photography, exploiting the
outstanding specifications of 0.95m MFD over the entire zoom range and 1:3.5
maximum magnification ratio.
Optimized for digital SLR
The new Tamron AF 55-200mm Di zoom lens features an entirely new optical design
for optimizing the overall distribution of optical power while reducing various
aberrations to the absolute minimum and achieving remarkable downsizing at the
same time. In addition, an LD (Low Dispersion) glass element is 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 performance over the entire zoom
range. 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 by considering the effects of variances due to
zooming.
Enhanced peripheral illumination and Resolution
Peripheral light fall-off is minimized when compared with that of conventional
lenses for film cameras, so 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 resolution, contrast and flatness of image field.
Internal Surface Coating and Design
By 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, ghosting and flare due to
reflections that occur when light enters through the front element and
reflections caused by the imagers themselves are reduced to the absolute minimum.
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.
Super hybrid mount
The Tamron AF 55-200 Di II LD lens features a super hybrid mount made of highly
durable, lightweight engineering plastic precisely molded around a stainless
steel “core” that is also highly durable. The Tamron lens mount
portion weighs 70% less than a brass-made mount.
