Pre-PMA 2008: To satisfy photographers who are absolutely terrified of the things they like to photograph, Sigma has introduced the frankly enormous 150-500mm f/5-6.3 zoom. It's packed with Sigma's technological goodies, including Optical Stabilization and Hypersonic autofocus motor and will be available in Sigma, Canon, Nikon, Pentax and Sony mounts.

Source: News: Digital Photography Review (dpreview.com)