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Photo courtesy of Tamron, modified by Shawn Barnett Tamron announces two digital-specific lenses
By Shawn Barnett, The Imaging Resource
(Friday, February 25, 2005 - 16:35 EST)

Tamron announced two interesting lenses for APS C-sized digital SLRs at PMA. Dubbed "Di" for Digitally Integrated design, the lenses are meant for 24mm x 16mm sensors, and are not intended for 35mm SLRs. A quick look at the zoom specs tells you that they'll be excellent for the intended audience.

The SP AF11-18mm F/4.5-5.6 Di-II LD Aspherical lens gives digital SLRs equipped with APS C-sized sensors a focal length equivalent of 17-28mm on a 35mm camera, offering the true wide angle many have been waiting for.


The AF11-18mm uses one high dispersion glass element in conjunction with a low dispersion gladd to "minimize on-axis and lateral chromatic aberrations" according to the press release (below).



The AF18-200mm F/3.5-6.3 XR Di-II LD Aspherical Macro picks up where the former leaves off, taking the photographer from the equivalent of a 28-300mm lens on a 35mm camera. This lens uses what Tamron calls XR elements (for Extra Refractive Index) to overcome some of the limitations of such a wide-ranging zoom lens.

Original Source Press Release:

TAMRON INTRODUCES SP AF11-18MM F/4.5-5.6 DI-II LD ASPHERICAL (IF), AND AF18-200MM F/3.5-6.3 XR Di II LD ASPHERICAL (IF) MACRO

Press Release #1

TAMRON INTRODUCES SP AF11-18MM F/4.5-5.6 DI-II LD ASPHERICAL (IF)

A New High Performance Zoom Lens Designed FOR EXCLUSIVE Use on Digital SLR Cameras Covering the Ultra Wideangle Range

PMA, Orlando, Florida, February 20, 2005 - Mr. Morio Ono, President of Tamron Co., Ltd., announced that the SP AF11-18mm F/4.5-5.6 Di-II LD Aspherical (IF) (Model A013), a new high performance ultra wideangle zoom lens designed exclusively for digital SLR cameras with smaller-size image sensors, will be available in late spring 2005.

The new SP AF11-18mm F/4.5-5.6 Di-II LD Aspherical (IF), an ultra wideangle zoom lens, is designed for exclusive use on digital SLR cameras with smaller-size image sensors. The lens provides reliable performance in a compact size to meet the needs of digital SLR camera users pursuing creativity in wideangle photography. The lens uses a new optical system specially designed for digital SLR cameras, in addition to the use of a glass-molded aspherical element having a large clear aperture, hybrid aspherical elements, and elements using such special glass materials as high index/high dispersion glass and low dispersion optical glass, for outstanding optical performance.

* "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
* Dedicated for Digital SLR Cameras
Through the employment of an optical design for exclusive use with digital SLR cameras, an ultra wideangle zoom lens with a focal length equivalent to a 17-28mm when converted to that of a 35mm full size film camera lens has been realized. Using this lens along with the digital SLR-dedicated AF18-200mm zoom lens introduced by Tamron simultaneously, or Tamron's AF17-35mm Di already available, you can enjoy creative digital SLR photography with a wide choice of angles of view.

* Features an Optical System Optimized for Characteristics of Digital Cameras
The optical system uses one element each of HID (High Index/High Dispersion glass) and LD (Low Dispersion) glass to minimize on-axis and lateral chromatic aberrations that are the greatest hindrance to high optical quality. In addition, the lens uses a high-precision, large clear aperture, glass-molded aspherical element and two hybrid aspherical elements to thoroughly compensate for spherical and chromatic aberrations and distortion, in order to achieve outstanding optical quality.

* Optical Design Dedicated to Digital SLR Photography by Optimizing the Angles of Incidences of Light Rays Reaching the Imager
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.

* Outstanding Resolution
Since the lens is designed exclusively for digital SLR photography, it provides high image quality in terms of resolution, contrast and flatness of image field.

* 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.

* 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 Precision Image"
Improvements have been made to the external design by adding a gold-colored band above the focus ring 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.

SPECIFICATIONS
Model Name : A013
Focal Length : 11-18mm
Maximum Aperture : F/4.5-5.6
Angle of View (Diagonal) : 103?29' - 75?33'
Lens Construction : 15 elements in 12 groups
Minimum Focus Distance : 0.25m (9.8 in.) (throughout the entire zoom range)
Maximum Mag. Ratio : 1:8
Filter Diameter : (77mm
Overall Length : 78.6mm (3.1 in.) *
Maximum Diameter : (83.2mm (3.3 in.)*
Weight : 355g (12.5oz.)*
Diaphragm Blade : 7 blades
Minimum Aperture : F/22
Standard Accessory : Flower-shaped Lens Hood
Compatible Mount : Canon AF, Konica Minolta AF-D and
Nikon AF-D
*Values given are for Nikon cameras.


-----------
Press Release #2

TAMRON ANNOUNCES AF18-200MM F/3.5-6.3 XR Di II LD ASPHERICAL (IF) MACRO

A New High Power Standard Zoom Lens Designed for Exclusive Use with Digital SLR Cameras

PMA, Orlando, Florida, February 20, 2005 - Mr. Morio Ono, President of Tamron Co., Ltd., announced the spring delivery of the AF18-200mm F/3.5-6.3 XR Di-II LD Aspherical (IF) Macro (Model A014), a new high power zoom lens designed exclusively for digital SLR cameras with smaller-size image sensors.

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
* 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 introduced by Tamron simultaneously, 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 Image Sensor
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.

* Outstanding Resolution
Since the lens is designed exclusively for digital SLR photography, it provides high image quality in terms of resolution, contrast and flatness of image field.

* 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 conveniently.

* 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 manufacturing technology.

* Zoom Lock Mechanism Incorporated
The Zoom Lock prevents unwanted barrel extension when carrying the lens/camera combination.

* 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 Precision Image"
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.

SPECIFICATIONS

Model Name : A014
Focal Length : 18-200mm
Maximum Aperture : F/3.5-6.3
Angle of View : 75°33' - 7 °59'
Lens Construction : 15 elements in 13 groups
Minimum Focus Distance : 0.45m (17.7")
Maximum Mag. Ratio : 1:3.7 (at f=200mm MFD 0.45m)
Filter Diameter : (62mm
Overall Length : 83.7mm (3.3") *
Maximum Diameter : (73.8mm (2.9")
Weight : 398 grams (14oz.) *
Diaphragm Blades : 7 blades
Minimum Aperture : F/22
Standard Accessory : Flower-shaped Lens Hood
Compatible Mount : Canon AF, Konica Minolta AF-D, Nikon AF-D and Pentax AF
*Values given are for Nikon AF cameras.

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