AF-S Teleconverter TC-14E II

The AF-S Teleconverter TC-14E II extends the focal length of select compatible lenses by a factor of 1.4x while also decreasing the effective widest aperture by the same factor. Attaching a TC to your lens will almost always result in a noticeable drop in image quality and autofocus speed. Also, Teleconverters are not compatible with most lenses.