Sony dt 55 200mm f4 56 sam lens is a medium to telephoto lens with internal focus motor offering 35mm equivalent focal lengths of 825 300mm on a sony alpha digital slr it is both compact and lightweight making it a useful take everywhere lens as one of sonys dt lenses it has been designed specifically for use with their aps c sized digital sensors in the sony alpha range of cameras the inclusion of the sam smooth autofocus motor makes for smooth af operation