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Tokina at-X PRO M 100mm F2.8 D Macro Lens - Nikon AF Mount
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About Tokina At-X PRO M 100mm F2.8 D Macro Lens - Nikon
Product Description Tokina Lens AT-XM100PRO D (Nikon Fit)The AT-X 100 PRO D is a macro lens capable of life-sized (1:1) reproduction at 11.8 inches (30 cm). The lens multi-coating has been re-engineered to match the highly reflective silicon based CCD and CMOS sensors in today's digital SLR cameras. This lens gives the higher of both worlds because optics still give full coverage and excellent sharpness on 35mm film. A macro lens that can handle both the digital and film worlds with ease. Specifications:Zoom range: 100 mmMaximum aperture: F/2.8 Minimum aperture: F/32 Optical construction: Nine elements in eight GroupsAngle of view: 24 degrees 30' Minimum focus distance: 11.8" (30 cm) Macro ratio: 1:1Focus limiter: 1.28 to infinityNumber of diaphragm blades: 9Filter size: 55 mm Width: 73 mmHeight: 95.1 mm Weight: 19 oz (540 g)Dedicated lens hood includedFocus Limiter SwitchThe AT-X 100 PRO D also has a very convenient focus limiter switch that can lock the focus making it faster to focus when used as a moderate telephoto lens that is excellent portraits as well. Tokina One Touch Focus ClutchTokina One Touch Focus Clutch mechanism for fast easy switching between manual and auto focus. Non-Rotating Filter55 mm non-rotating filter thread for use with macro ring flashes and special effects filters. Tokina Optical TechnologyAspherical OpticsA 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 highly 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 greater 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, the world's largest optical glass manufacturer, Tokina has succeeded in producing high quality precision moulded all glass elements with a greater aspherical shape than any other lens manufacturer. This technique is unparalleled in its technological sophistication and precision.F&R AsphericalThis lens, the AT-XM100 PRO D 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 DispersionWhen 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 colors 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 colors, akin to an "optical noise" that has a negative impact on the quality of the picture. To eliminate chromatic aberration, Tokina employs expensive, 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, minimi
