The nikon tc 14e af s teleconverter iii with 14x magnification increases the focal length of select nikon lenses see further details for lens chart by 40 percent teleconverters are well suited to use with fast prime and zoom lenses and are ideal for sports press and wildlife photographers who want to extend the reach of an existing lens without spending an absolute fortune the tc 14e iii boasts a smaller build and improved ergonomics including a redesigned lens barrel and fluorine coati