The Tamron 28-75mm f/2.8 XR Di LD for Sony is a midrange zoom designed for full-frame Sony DSLRs. Key features include:

Excellent Quality at a Low Price. The Tamron 28-75mm f/2.8 XR Di LD for Sony is sharp, has a wide aperture, and is significantly less expensive than comparable zooms. Its fast, constant f/2.8 aperture allows for great subject-background separation and makes low-light shooting possible.

Advanced Optical Design. Its fourteen-group/sixteen-element optical formula features extra-refractive index and low-dispersion elements, which give you sharp, high-contrast images across the image plane. By utilizing an aspherical element, the 28-75mm produces high color accuracy and very little chromatic aberration.

Fast, Accurate Autofocus. It autofocuses accurately and quickly, and its internal-focus design means the lens doesn’t extend during autofocus. The non-rotating front element allows uninhibited filter use.