From the Manufacturer
A superb zoom lens for everyday photography -- the lens youll put on, and leave on. This superb standard lens for the Sony Alpha DSLR-A100 camera handles the full range of shots youll take most often -- but theres nothing "standard" about its advanced optical design. In 35mm equivalent, it covers wide-angle 27mm to 105mm midrange telephoto for snapshots, portraits, interiors,+ and more -- an excellent all-around lens to travel with.
DT lens design
A more compact, lightweight lens designed specifically for the APS-size CCD imager used in the Sony Alpha DSLR-A100 camera.
Aspherical lens elements
To correct visual aberrations at wide-angle setting, enabling a lightweight lens to capture more visually accurate wide-angle shots.
ED (Extra-low Dispersion) glass
To reduce chromatic aberration at telephoto extension, correcting certain wavelengths of light for sharp, clear images with well defined colors.
Because aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect.
Sony SAL-1870 DT 18-70mm f/3.5-5.6 Zoom Lens - f/3.5 to 5.6