Extend a compatible lens' effective focal length up to 70% using this Nikon 2151 AF-S teleconverter, which features a 1.7x optical conversion factor to create expanded telephoto coverage, so you can capture crisp shots of distant subjects. Compatible with most Nikon NIKKOR FX and DX lenses; 1.7x optical conversion factor; Nikon IC (Integrated Coating); AF-S Silent Wave Motor Color: Black.