Nikon AF-S FX NIKKOR 200-500mm f/5.6E ED Vibration Reduction Zoom Lens with Auto Focus for Nikon DSLR Cameras (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. 500mm of zoom power on FX-format DSLRs; 750mm equivalent on DX-format DSLRS Fast f/5.6 constant aperture for beautiful out-of-focus backgrounds and low-light performance 4 stops of Vibration Reduction with specialized Tripod and Sports modes AF compatible with optional TC-14E series teleconverters and DSLRs that offer f/8 support