Tamron SP 35mm f/1.4 Di USD lens for Canon

Consummate image quality across the entire frame from edge-to-edge
The optical construction (14 elements in 10 groups) leverages the best of Tamron technology and features a generous arrangement of special glass materials including four LD (Low Dispersion) and three GM (Glass Molded Aspherical) lens elements. This combination of components successfully eliminates the effects of chromatic aberrations (which are particularly perilous for high-speed lenses) as well as other optical aberrations to the greatest extent possible. Even at its maximum aperture of F/1.4, high resolution performance is achieved from the center of the frame to the edges, providing superior aberration correction to maintain perfect fidelity of point shapes. The result is ultimate ultra-high image quality.

Exceptionally reliable, fast and accurate AF
The AF drive is equipped with Tamron’s proprietary USD (Ultrasonic Silent Drive). This technology affords an autofocusing system with high speed, precision and quiet operation—even in a large aperture lens, which is typically bigger and heavier.

Moisture-Resistant Construction
Seals are located at the lens mount area and other critical locations to prevent infiltration of moisture and/or rain to provide Moisture-Resistant Construction. This feature affords an additional layer of protection when shooting outdoors under adverse weather conditions.