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The Sigma's construction is the most complex in its class and includes no fewer than four elements made from Super-Low Dispersion (SLD) glass, along with one formed from fluorite-like 'F' Low Dispersion (FLD) glass, and two aspheric elements. According to Sigma, this allows the minimization of an array of aberrations including both longitudinal and lateral chromatic aberration, astigmatism, and field curvature.
The lens also incorporates an ultrasonic-type HyperSonic Motor for fast, quiet autofocus with full-time manual override. This drives a floating inner focus system, that's designed to maintain high image quality at all subject distances. The aperture diaphragm uses nine curved blades for the attractive rendition of background blur, and Super-Multi-Layer Coating is employed to minimise flare and ghosting. Sigma says each lens will be individually inspected before leaving the factory, using a measuring system based on its own high-resolution Foveon sensor.