A NEW HIGH PERFORMANCE ZOOM LENS DESIGNED FOR EXCLUSIVE USE WITH DIGITAL (APS-C) SLR CAMERAS COVERING THE ULTRA WIDEANGLE RANGE
SP AF11-18mm F/4.5-5.6 Di-II LD ASPHERICAL (IF)
Photokina, Cologne, Germany, September 28, 2004 - Mr. Morio Ono, President of Tamron Co., Ltd., announced the successful development of the SP AF11-18mm F/4.5-5.6 Di-II LD Aspherical (IF) (Model A13), a new high performance ultra wideangle zoom lens designed exclusively for digital SLR cameras using APS-C size image sensors.
The new SP AF11-18mm F/4.5-5.6 Di-II LD Aspherical (IF), an ultra wideangle zoom lens, is Tamron's first lens designed for exclusive use with digital SLR cameras using APS-C 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" is the designation
Tamron puts on lenses designed for exclusive use with digital (APS-C
size) SLR cameras, featuring optical systems optimized to meet the performance
characteristics of digital cameras.
* "Di-II" lenses cannot be used with digital SLR cameras using image sensors that are larger than that of an APS-C size imager, or with 35mm film SLR cameras.
[ MAIN FEATURES ]
Dedicated for Digital SLR Cameras
Through the employment of an optical design for exclusive use with digital (APS-C) 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, you can enjoy creative digital SLR photography with a wide choice of angles of view.
Features an Optical System Optimized for Characteristics of Digital
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 hybrid 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.
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 Conveys "High Performance, High Precision Image" as
One of the New Di-II Series
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.
Model Name A13
Focal Length 11-18mm
Maximum Aperture F/4.5-5.6
Angle of View 103- 75(APS-C Size)
Lens Construction 15 elements in 12 groups
Minimum Focus Distance 0.25m (9.8") (throughout the entire zoom range)
Maximum Mag. Ratio 1:8
Filter Diameter 77mm
Overall Length 78.6mm (3.1") *
Maximum Diameter 82.2mm (3.3")*
Diaphragm Blade 7 blades
Minimum Aperture F/22
Standard Accessory Flower-shaped Lens Hood
Compatible Mount Canon AF, Minolta AF and Nikon AF-D
*Values given are for Nikon AF cameras.
**The value given is for Canon AF cameras.