Canon EF-S 55-250mm F4-5.6 is STM Lens for Canon SLR Cameras (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com Focal length and maximum aperture: 55-250mm 1:4-5.6 Lens construction: 15 elements in 12 groups Diagonal angle of view: 27 Degree 50 ft. - 6 Degree 15 ft. Rear focus system, Closest focusing distance: 0.85m/2.8 ft.