AF-S Teleconverter TC-14E-II multiplies the effective focal length by 1.4x of select compatible NIKKOR lenses, offering an affordable and portable gateway to extend telephoto reach; ideal for sports shooting, wildlife, surveillance and more.Nikon AF-I and AF-S teleconverter will only mount original Nikon Nikkor AF-S and AF-I lenses (without modification).[3][4] Modification needs removal of a small part.Not recommended for use with Nikon DX format lenses although it mounts (with modification).Although not recommended,[8] teleconverters are used in the Nikon 1 series with Mount Adapter FT1 for extreme telephotos.