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.

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.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. 

 

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.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.