From the Manufacturer:
The latest advances in optical design technology have made it possible to deliver prized Carl Zeiss contrast and clarity in a high-performance mid-range zoom lens that is remarkably compact and convenient to use. Four aspherical elements are a product of innovative Sony high-precision, with advanced aspherical lens (AA lens) technology, enabling first-class performance in a diminutive design. You can shoot at the maximum f/4 aperture right out to the telephoto end of the zoom range, and linear motor-driven internal focusing provides smooth, quiet zooming that, coupled with an ultra-responsive AF, makes this outstanding lens ideal for shooting movies as well as stills. Lens-shift image stabilization minimizes the effects of camera shake in the widest possible range of shooting situations, so you always get optimum image quality. An elegantly finished metal exterior emphasizes the overall excellence of this sophisticated design.
Carl Zeiss mid-range zoom lens
Outstanding contrast and resolution throughout the image area at all zoom settings are the hallmark of this high-performance Carl Zeiss mid-range zoom lens. The renowned Zeiss T* (T-star) coating minimizes glare and ghosting that can degrade image quality, contributing to natural color reproduction as well as superb definition and clarity.
Optical SteadyShot image stabilization
Optical SteadyShot image stabilization provides a marked reduction in image blur cause by camera shake, especially when shooting handheld at telephoto focal lengths or in dim indoor lighting. In the Anti Motion Blur and Handheld Twilight modes this technology makes it easier than ever to shoot clear, blur-free, low-noise images at night, indoors, or in any conditions that would otherwise be a challenge due to low light conditions, without having to boost sensitivity or use a tripod.
Constant F4 maximum aperture
A constant F4 maximum aperture throughout the zoom range allows the user to use optimum exposure parameters for the shot he or she visualizes at any focal length. The ability to use apertures of F4.0 at the telephoto end of the zoom range also reduces the need to use high ISO settings and allows the use of high shutter speeds to capture action when necessary. A circular aperture design helps to deliver smooth background defocusing.
High lens technology in a compact body
The 4x zoom range of this lens extends from 24mm to 105mm (35mm full equivalent), making it ideal for a wide range of common subject and situations. A significant reduction in overall lens size, while maintaining first-class image quality, has been realized thanks to advanced Sony high precision, advanced aspherical lens (AA lens) production technology. The lens is compact and lightweight, making it a convenient portable choice for casual day-to-day shooting as well as landscapes, snapshots, portraits and more.