Tokina 11-16 EF

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.

Focal Length: 11-16mm
Maximum Aperture: f/2.8
Minimum Aperture: f/22
Automatic Aperture: Yes
Angle of View: 104°-82°
Minimum Focusing Distance: 0.3m
Macro Ratio 1 : 11.6
Focusing Mode: Automatic
Manual Focusing Ring: Yes
Autofocus Switch: Clutch Ring
Focusing Type: Internal Focus
Filter Size: 77mm
Coating: Multi-coating
Construction E/G: 13 Elements in 11 Groups
Aperture Blades: 9
Lens Hood: BH-77A
Electrical Contacts: Yes
Dimensions: 84×89 mm
Weight: 550g

Lens Cap front
Lens Cap rear
Lens Hood