Tamron SP AF11-18mm F/4.5-5.6 Di-II LD Aspherical (IF)

For Canon DSLR EOS Mount

An ultra-wideangle zoom lens which 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.

FEATURE SUMMARY

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 realised. Using this lens along with the newly digital SLR-dedicated AF18-200mm zoom lens also introduced by Tamron, you can enjoy creative digital SLR photography with an astonishing choice of angles of view.

Features an optical system optimised for the characteristics of digital cameras
The optical system uses one element each of HID (High Index/High Dispersion glass) and LD (Low Dispersion) glass to minimise 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 optimising 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 centre to the periphery, by considering the effects of variances due to zooming.

Enhanced peripheral illumination
Peripheral light fall-off is minimised when compared with that of conventional lenses for film cameras so that images are uniformly bright from the centre 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 to address 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. These minimise reflections that occur when light enters through the front element and also reduce image-degrading effects caused by the imagers themselves.

Flower-shaped lens hood
A glare-reducing flower-shaped lens hood is supplied 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-coloured 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 complement the digital camera design style and to provide better handling.

SPECIFICATIONS

Model no.	A013
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 magnification ratio	1:8
Filter diameter	77mm
Overall length	78.6mm (3.1")*
Maximum diameter	82.2mm (3.3")*
Weight	375g**
Diaphragm blades	7 blades
Minimum aperture	F/22
Supplied accessory	Flower-shaped Lens Hood
Mounts available	Canon AF, Nikon AF-D