The tamron af sp 10 24mm f35 45 di ii ld aspherical sony fit lens if features an huge 24x zoom ratio unprecedented in its class of ultra wide angle zoom lenses the innovative high performance ultra wide angle zoom lens is designed exclusively for slrs with aps c sized image sensors the sp af 10 24mm di ii from tamron is the first ever ultra wide angle lens for digital slr cameras and features a focal length range with the 35mm equivalent of 16mm ultra wide angle to 37mm semi wide angle