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Tokina AT-X 116 PRO DX-II 11-16mm f/2.8 Lens for Canon Mount
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Tokina AT-X 116 PRO DX-II 11-16mm f/2.8 Lens for Features
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Ultra-wide angle zoom lens
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Internal silent focusing motor
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Fast internal focusing
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One touch focus clutch mechanism
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Water resistant optical coating on the glass for ease of cleaning
About Tokina AT-X 116 PRO DX-II 11-16mm F/2.8 Lens For
Based on the high quality optical design of the AT-X 124 PRO DX (12-24 mm f/4) lens, the AT-X 116 PRO DX has a slightly shorter zoom range to maintain optical quality at wide apertures and has an internal silent focusing motor to allow the lens to AF on Nikon bodies that do not have an AF drive gear and motor. One Touch Focus Clutch: Tokina's One-touch Focus Clutch mechanism allows the photographer to switch between AF and MF simply by snapping the focus ring forward for AF and back toward the camera to focus manually. There is no need to change the AF-MF switch on Nikon cameras and there is no second AF/MF switch on the lens for Canon, everything is accomplished by the focus ring. Tokina Optical Technology: Aspherical Optics - a standard lens is made up of a combination of spherical lens elements. Individual "lenses" within the lens are commonly referred to as "elements". A spherical element has an even curve to the surface of the glass. However, there can be problems with such elements; light entering the centre of the lens and light entering at the edge may not be perfectly focused at the same point. This is called spherical aberration. More enhanced computer assisted optical designs are creating lenses with more spherical elements. More spherical elements within a lens means a higher risk of spherical aberration having a negative impact on optical quality. Wide-angle zoom lenses and wide-angle lenses with large apertures are especially at risk for spherical aberration. To eliminate spherical aberration, Tokina employs aspherical all-glass elements in many of its optical designs to correct this problem. The aspherical shaped surface of the lens element focuses light rays entering both the centre and edge of the element correctly at the film plane for an accurately focused image. In addition to correcting spherical aberration, these elements fully correct light quantity and distortion at the edge of the image and provide excellent results when used in combination with a floating element design. Through a close collaboration with Hoya Corporation, one of the world's largest optical glass manufacturer, Tokina has succeeded in producing high quality precision moulded glass elements with a bigger aspherical shape than any other lens manufacturer. This technique is unparalleled in its technological sophistication and precision. F&R Aspherical: This lens, the AT-X116 PRO DX encompasses Tokina's new F&R aspherical moulded glass elements. These give outstanding performance with very even illumination in the corners and correction of spherical aberration across the image area. SD Super Low Dispersion: When standard optical glass is used in telephoto lenses, a phenomenon called chromatic aberration can occur. Chromatic aberration is the inherent tendency for glass to disperse (separate) a ray of light into the colours of the rainbow. The rainbow effect created by a glass prism is the most dramatic demonstration of chromatic aberration. In lenses, it is much less pronounced, but still creates slightly out of focus colours, akin to an "optical noise" that has a negative impact on the quality of the picture. To eliminate chromatic aberration, Tokina employs special glass material having super- low dispersion (SD) properties. Lenses in the Tokina line-up with the SD mark incorporate these Super-Low Dispersion glass elements, minimising the secondary spectrum or optical noise caused by chromatic aberration. HLD: Tokina's wide-angle and standard zoom lenses feature a higher quality of optical glass known as Tokina HLD (High-refraction, Low Dispersion) glass. Having higher refractive index and lower dispersion properties, HLD glass is far less likely than standard optical glass to create lateral chromatic aberration, which is often a problem with conventionally designed wide-angle lenses. Multi-Coating: Reflections off the surface of lens elements are the enemy to any photographer and to every lens manufacturer. They are reduced or eliminate
