As fast lenses become increasingly popular, Tamron has responded with products that overcome classic design challenges such as chromatic aberration and flare. This includes a “dense” arrangement of elements and groups, use of glass-moulded aspherical lens elements, and a newly developed BBAR-G2 coating that renders fine subject detail and stunning contrast even under backlit conditions. In addition, a new Dynamic Rolling-cam mechanism operates the heavy focusing unit of the large f/1.4 aperture with high-speed accuracy.