Despite its very fast maximum aperture of F/2, this lens has outstanding compactness, light weight and optical quality at every aperture and focusing distance. It incorporates the Floating System for correction of inherent aberrations at close focusing distances; it can be used at minimum focusing distance with top quality results. SPECIFICATIONS: * Type: super-wide-angle * Construction: 11 elements in 9 groups * Angle of view: 84 degrees * Minimum Aperture: F/22 * Closest Focusing Distance: 1ft * Filter size: 52 * Lenshood: optional BW-52C * Length: 2 in * Weight: 10oz.