The telephoto zoom lens with an L mount is characterized by a bright constant maximum aperture of f/2.8 and advanced optical performance and focusing performance. The optical arrangement incorporates multiple aspherical and low dispersion elements to minimize chromatic and spherical aberrations throughout the zoom range for greater sharpness and accurate rendering.

Complementing the optics is a unique dual-focus system, which uses both a linear motor and a stepping motor, to provide exceptionally fast and accurate focusing performance.

A focus clutch also allows for particularly quick switching between AF and MF settings for optimized control. Additionally, the optical image stabilizer reduces the effects of camera shake for sharper handheld shots, and the lens features a weather-sealed design for use in harsh conditions.