The Nikon Nikkor TC-20E II is a 2x teleconverter lens suitable for wildlife, sports, and surveillance photography. With a conversion factor of 2x, this Nikon tele extender lens is used with compatible NIKKOR lenses to double the focal length. The Nikon Nikkor TC-20E II 2x teleconverter lens lets you take enlarged FX, DX and 35 mm size format pictures. With a construction of 7 elements in 6 groups, the Nikon Nikkor TC-20E II delivers quality pictures. This Nikon tele extender lens has an integrated coating that reduces flare and enhances color consistency.