Sigma TC-1401 1.4x Teleconverter for Nikon F (Black) - 5PC Accessory BundleShort Description Nikon F Teleconverter 1. 4x Magnification Factor Communication Between Lens & Camera AF Operates at up to f 8 One Special Low Dispersion Element Dust and Splashproof Compatible with Select Sigma Lenses Kit Includes Sigma TC 1401 1. 4x Teleconverter for Nikon F ULTIMAXX BLOWER ULTIMAXX Small Gadget Bag Case ULTIMAXX LENS CLEANING PEN ULTIMAXX Microfiber Cleaning Cloth ULTIMAXX STARTER CLEANING KIT In The Box With The Main Item Sigma