In order to achieve the best-in-class image quality, the fast standard zoom lens with a constant aperture of F2.8 consists of 17 elements in 12 groups.
Three aspherical lens elements to control spherical aberration and distortion, and three ED glass lens elements to reduce lateral chromatic aberration (wide-angle) and axial chromatic aberration (telephoto), thereby achieving edge-to-edge sharpness across the entire zoom range.
Nine rounded aperture blades create a smooth, circular bokeh. The suppression of spherical aberration to the ultimate extent contributes to produce beautiful bokeh at both the front and back.
By reducing the weight of the focus lens and mounting the Twin Linear Motor, high-speed, quiet AF is possible. The fastest AF speed of 0.06 seconds brings comfort to your photo-shoot when by combining this lens with an X Series camera body offering Phase Detection AF.
Lens configuration: 17 elements 12 groups (includes 3 aspherical and 3 extra low dispersion elements)Focal length: f=16-55mm (24-84mm)Angle of view: 83.2°- 29°Aperture: F2.8 - F22Aperture control: 9 Blades (rounded diaphragm opening), 1/3EV (19 steps)Focus range: Normal 0.6m - ∞, Macro 30cm - 10m (Wide), 40cm - 10m (Telephoto)Max. Magnification: 0.16xDimensions: ø83.3mm x 106.0mm (Wide) / 129.5mm (Telephoto)Weight: 655gFilter size: ø77mm