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Lens technology created to help control chromatic aberrations that would otherwise degrade image contrast and sharpness. LD elements are made from special glass materials with extremely low dispersion indices (characteristics that separate or refract a ray of light into rainbow colours) that effectively compensate for chromatic aberration that is particularly a problem at the telephoto end.

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Lens technology created to help control chromatic aberrations that would otherwise degrade image contrast and sharpness. Anomalous Dispersion glass is a special optical glass that delivers an abnormally large partial dispersion ratio (amount of dispersion at a given wavelength range within visible light) relative to a specific wavelength zone.
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An aspheric lens or asphere is a lens whose surfaces have a profile that is neither a portion of a sphere nor of a circular cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.
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Is the designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras as well as film cameras. These lenses may be used on cameras with full format (FF) or APS-C sensors (with a crop factor relative to the camera).
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Lenses are designed for exclusive use on digital cameras with smaller-size imagers (also known as APS-C sensors). These lenses are not designed for conventional cameras and digital cameras with image sensors larger than 24mm x 16mm.
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All focusing occurs within the lens, i.e. the lens will not change size as it zooms. Usually a desirable function of a lens.
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