Sigma 18-50mm F3.5-5.6 DC Lens announced, designed specifically for digital SLR cameras. Supports Sigma, Nikon, Canon and Pentax lens mounts.

Sigma Press Release

Zoom lens that designed to suit the characteristics of digital cameras.
Exclusively designed to suit the characteristics of digital SLR cameras. The image circle was designed to match the size of the image sensors of most digital SLR cameras and this has resulted in a compact lightweight lens. The use of aspherical lenses provides correction for various aberrations and makes high quality images a reality throughout the entire zoom range. Corresponding AF Mounts: SIGMA SA mount, NIKON mount, CANON mount, PENTAX mount.

Compact-Lightweight zoom lens
Compact-Lightweight zoom lens has a maximum diameter of 62mm (2.4in.), overall length of 67.5mm (2.6in.) and weight of only 250gr (8.7 ounces) and filter size of 58mm. Compact dimensions offers superb handling and mobility. The use of aspherical lenses provides correction for various aberrations throughout the entire zoom range and produce high level of optical performance.

Exclusively designed to suit the characteristics of digital SLR cameras.
We took digital characteristics into consideration when designing the lens power layout and created the most suitable lens that makes high quality images a reality throughout the entire zoom range. We used the most appropriate coating for digital products to cut down flare and ghost caused by digital SLR cameras and to produce the best color balance. It can be used with the supplied lens hood to block out extraneous light.

Very convenient lens design
18-50mm F3.5-5.6 DC zoom lens has a minimum focusing distance of 25cm (9.8in.) at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.5. The focus ring provides easy operation in manual mode. A distance scale on the focus ring is an easy to use and convenient addition.

Specifications

Lens Construction 8 Elements in 8 Groups
Angle of View 69.3 - 27.9 degrees
Number of Diaphragm Blades 7 Blades
Minimum Aperture F22
Minimum Focusing Distance 25cm
Maximum Magnification 1:3.5
Filter Size Diameter 58mm
Dimensions Diameter 67.5mm X Length 62mm
Weight 250g
Corresponding AF Mounts SIGMA,
CANON,
NIKON (D),
KONICA MINOLTA,
PENTAX,
Four Thirds