This 18-55mm f/3.5-5.6 DT Standard Zoom Lens from Sony is is a DT-series Alpha lens that has been optimized for cropped image sensors, and as a result it is not recommended for use with larger full-frame cameras. It's 18-55mm focal length is the 35mm equivalent of a longer 27-82.5mm standard zoom lens. It is constructed of 8 elements in 7 groups, including two aspheric lens elements, which help to deliver sharp, clear photos throughout the zoom range. It has a minimum focusing distance of 9.8" and a front-end filter diameter of 55mm.
35mm Equivalent: 27-82.5mm
This 18-55mm lens has a 3.1x zoom factor, and is the 35mm equivalent of a 27-82.5mm lens on the cropped APS-C cameras it was designed for.
Aperture Range: f/3.5-36
This lens has a varying maximum aperture of f/3.5-5.6 as you increase the focal length, and minimum aperture of f/22-36.
Optimized For APS-C Size / DT-Format Alpha & Minolta DSLRs
Optimized for Sony Alpha APS-C sensor cameras, this lens covers a 3.1x zoom range from 18mm to 55mm, which is the 35mm equivalent of an 27-82.5mm lens.
2x Aspheric Glass Lens Elements
These precision lens elements correct distortion for sharper, more visually accurate images across the entire zoom range of the lens.
Smooth Autofocus Motor (SAM)
Designed for fast, smooth and silent automatic focusing, Sony's unique Smooth Autofocus Motor (SAM) technology achieves high torque at low speed with rapid start/stop response. The AF control signals from the camera body are sent to the lens-mounted SAM unit, which drives the lens directly, helping to assure quick and accurate AF response.
7x Circular Aperture Blades
Circular aperture blades produce smooth, rounded bokeh background effects when capturing spot-light sources in your pictures. Because the aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect.
Filter Diameter: 55mm
The 55mm from filter thread does not rotate, allowing rotating polarizing filters to be used.