Nikon Teleconverters are
designed with utmost precision to yield the highest image quality. The Nikon
Teleconverters are available in x2 TC-20 EII, x1.7 TC-17 EII and x1.4
TC-14 EII for Nikon lenses. Generally
speaking you need a fast aperture in your lens to use them. No lens with
aperture lower than 4 will work with these teleconverters. Nikon Teleconverters
are ideal for wildlife photogrphy. Nikon brought our the new TC-20 MARK III with ED
glass, to enhance the sharpness of images.