The 28-75mm f/2.8 Alpha A-Mount Standard Zoom Lens from Sonycovers a wide range of focal lengths from wide angle to medium telephoto, and has a constant aperture of f/2.8 over its entire zoom range. This makes it particularly valuable for depth-of-field control and using ambient light.
It is constructed of 16 elements in 14 groups - four of them being aspherical glass elements - which all help to deliver sharp, clear photos throughout the zoom range. It has a minimum focusing distance of 1.25' and a front-end filter diameter of 67mm.
Aperture Range: f/2.8-32
With a maximum aperture of f/2.8 and minimum of f/32, this lens' high speed means you can capture images in darker conditions using faster shutter speeds and lower ISO sensitivity.
4x Aspherical 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: 67mm
The 67mm front filter thread does not rotate, allowing rotating polarizing filters to be used.
Zoom Lock Switch
Lock the lens' zoom to keep it right where you want it, preventing "lens creep" where the lens extends by its own weight when aimed downward - or retracts when aimed upward.