An optical design consisting of 12 elements in 10 groups including two GM (Glass Moulded Aspherical) lens elements ensure high resolution from edge to edge. The 11-20mm f/2.8 lens also incorporates one XLD (Extra Low Dispersion) and two LD (Low Dispersion) elements, which produce sharp images with well-corrected aberrations. Tamron’s BBAR-G2 (Broad-Band Anti-Reflection Generation 2) coating is employed to minimise ghosting and flare, helping to reveal the finest details even when your subject is backlit. This ensures that your results show high contrast and rich colours in virtually any shooting situation.

Tamron's RXD stepping motor unit is fast, accurate and extremely quiet, which provides sharp focus even with continuously moving subjects, whilst being ideal for both still and video. The quiet AF allows the lens to be used unobtrusively when shooting indoors and for video recording where low noise levels are essential.

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Tamron has placed seals around the lens mount and other critical areas, in order to prevent ingress of moisture and raindrops. The front surface of the lens element is also coated with a protective fluorine compound, which has excellent water and oil repellent properties, for easy cleaning of dirt and debris when required.