High-performance Nikon teleconverter. Perfect for enhancing zoom capabilities. The purpose of teleconverters is to increase the focal length of lenses, in other words to get closer to subjects, and the TC-20E III is the biggest and the longest teleconverter manufactured by Nikon – it doubles the focal length of a lens. While this teleconverter works with any professional Nikon lens that can take teleconverters, it is specifically designed to work with fast prime lenses with an aperture of f/2.8 and larger. The Nikon TC-20E III is targeted at sports, wildlife and other types of telephoto photography where the photographer cannot physically approach subjects. I am of the understanding that this teleconverter works but I have not been able to test it myself because it does not fit with my current lenses. Check the manual for a list of lenses that are comparable with this adapter. https://downloadcenter.nikonimglib.com/en/products/314/AF-S_Teleconverter_TC-20E_III.html