Sigma has announced the 70-300mm f/4-5.6 DG OS lens for Sigma, Sony, Nikon, Pentax and Canon mounts.  Sigma claims that the Optical Stabilization system will help you achieve an additional 4 stops of hand-holdability.  The new lens should be available at an initial retail price of $499.99.  Check availability on Amazon.com.

More details in the news release below. [Read more…]