Canon EF-S 55-250mm F4-5.6 IS STM Lens for Canon SLR Cameras Focal length and maximum aperture: 55-250mm 1:4-5.6 Closest focusing distance: 0.85m/2.8 ft. Lens construction: 15 elements in 12 groups Diagonal angle of view: 27 Degree 50 ft. - 6 Degree 15 ft. Rear focus system