The 135mm telephoto lens has long been a popular focal length among photographers, since its magnification is capable of bringing moderately distant subjects into frame-filling proportions. The F/3.5 lens is lighter (4oz.) and even more compact than the F/2.8 version. Construction: 4 elements in 4 groups Angle of view: 18 degrees Minimum focus: 5ft Aperture range: 2.8 - 22