Sigma 55-200mm F4-5.6 DC Lens announced, designed specifically for digital SLR cameras. Supports Sigma, Nikon, Canon and Pentax lens mounts.

Sigma Press Release

Compact and lightweight, high-performance telephoto Zoom Lens
This compact telephoto zoom lens was exclusively designed for use with digital SLR cameras. The image circle was designed to match the size of the image sensors of digital SLR cameras that also allows compact body and lightweight. Characteristics of digital cameras were taken into consideration when designing the lens power layout, making high-quality images reality through the entire zoom range.

Corresponding AF Mounts: SIGMA SA mount, NIKON mount, CANON mount, PENTAX mount.

Lightweight, high-performance, compact telephoto zoom lens
The image circle was designed to match the size of the image sensors of digital SLR cameras that also allows compact body and lightweight a maximum diameter of 71.5 mm (2.8in.), and overall length of 87.1mm (3.4in.), and weight of only 310g/10.9 ounces. It has a filter size of 55mm.

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.

High performance zoom lens is ideally suited to a wide range of subjects.
This lens has a minimum focusing distance of 110cm (43.3in.) and maximum magnification of 1:4.5.High performance 3.6x telephoto zoom lens suited a wide range of shooting conditions, such as portrait, sports, nature. The focus and zoom rings provide easy operation in manual mode. A distance scale on the focus ring is an easy to use and convenient addition.
* These lenses are designed specifically for use with the majority of digital SLR cameras featuring the smaller image sensors. Digital SLRs containing an image sensor larger than APS-C format and 35mm or APS SLR film cameras should not be used or image cut-off or vignetting will occur.

Specifications
Lens Construction 12 Elements in 9 Groups
Angle of View 25.5 - 7.1 degrees
Number of Diaphragm Blades 8 Blades
Minimum Aperture F22
Minimum Focusing Distance 110cm
Maximum Magnification 1:4.5
Filter Size Diameter 55mm
Dimensions Diameter 71.5mm X Length 87.1mm
Weight 310g
Corresponding AF Mounts SIGMA,
CANON,
NIKON (D),
KONICA MINOLTA,
PENTAX,
Four Thirds