Canon EF 50mm f/1.4 USM Standard & Medium Telephoto Lens for Canon SLR Cameras - Fixed (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 Standard focal length 50mm lens is effective in a multitude of shooting situations and ideal for day-to-day shooting Elements/Groups: 7/6; Diaphragm: Blades 8; Filter Thread: Font 58mm; An f/1.4 maximum aperture provides clear imaging in low light situations and shallow depth of field Ultrasonic autofocus motor (USM) operation is fast, smooth and virtually silent Two high-refraction lens elements and new Gaussian optics eliminate astigmatism and suppress astigmatic difference