Tamron has announced new Full Frame Ultra Wide Zoom: The Tamron 17-35mm F/2.8-4 Di OSD for Canon and Nikon DSLR Cameras. This new ultrawide lens features a weatherproof construction and a new fast and silent autofocus system called Optimized Silent Drive (OSD). This lens is also quite small and lightweight, especially when compared to their 15-30mm f/2.8 or the Nikon and Canon similar lenses. It is a little bit smaller than the Canon EF 17-40mm f/4L lens. Read more New Full Frame Ultra Wide Zoom: Tamron 17-35mm F/2.8-4 Di OSD ›