Kenko-Tokina 1.4X N-AF Teleplus Pro 300 teleconverter for Nikon F mount. This is a compact autofocus teleconverter for Nikon F-mount lenses. Clean glass, very minor dust. Compatible with many (but not all!) Nikon F mount lenses; unlike Nikon's teleconverters, this one will autofocus with non-AF-S lenses, too. General reminder: most DSLRs will only autofocus lenses with an f5.6 aperture or larger, and bearing in mind that this teleconverter will take away one stop of light, you may want to do the math before buying. For example, using his teleconverter, a 70-300mm f4-5.6 lens will become a roughly 100-420mm f5.6-8 lens, which will not autofocus at its longest end. In excellent condition.