Canon 8114B002 EF-S 18-55mm is STM (Certified Refurbished) This Certified Refurbished product is manufacturer refurbished, shows Limited or no wear, and Includes all original accessories plus a 90-Day warranty 18-55Mm focal length, f/3.5-5.6 is STM lens 28.8-88Mm equivalent focal length on Canon APS-C cameras F3.5-5.6 maximum aperture, f22-38 minimum Micromotor-type AF motor without full-time manual focusing, optical image Stabilizer system, offering the equivalent of four Stops of compensation