The 135mm focal length has been the ideal compromise between a portrait and long telephoto lenses for many photographers. Despite its ultra-high speed, this new lens is extremely sharp and free of aberrations. It is an entirely new design, featuring six elements in five groups, and measures only 3 1/2 inches in length. SPECIFICATIONS Type: telephoto Construction: 6 elements in 5 groups Angle of view: 18 degrees Minimum Aperture: F/32 Closest Focusing Distance: 4ft 5in Filter size: 72 Lenshood: Built-in Length: 3 1/2 in Weight: 24oz.