The Nikon TC-20E III 2x Teleconverter is the world's first to include an aspherical lens element. The Nikon AF-S Teleconverter TC-20E III is a completely new optical design designed to minimise its impact on image quality. The Nikon 20E III AF-S Teleconverter doubles the effective focal length of select compatible NIKKOR lenses, offering an affordable and portable gateway to extend telephoto reach; ideal for sports shooting, wildlife, surveillance and more. The Nikon TC- 20E III is compatible with the following lenses some with noted functional limitations. NIKKOR lenses not listed cannot be used with the TC-20E III. The rear elements of NIKKOR lenses not listed can contact and damage the Teleconverter element and must not be attached! List includes current lenses along with lenses for which production may have ceased. Lenses that are no longer in production are shown only for your convenience as a compatibility reference! 2160 AF-S VR Micro-NIKKOR 105mm f/2.8G IF-ED Autofocus not possible 2150 AF-S VR NIKKOR 200mm f/2G IF-ED No limitations 2186 AF-S NIKKOR 300mm f/2.8G ED VR II No limitations 2154 AF-S VR NIKKOR 300mm f/2.8G IF-ED No limitations 1942 AF-I NIKKOR 300mm f/2.8D IF-ED No limitations 1909 AF-S NIKKOR 300mm f/4D IF-ED Autofocus not possible 2171 AF-S NIKKOR 400mm f/2.8G ED VR No limitations 2127 AF-S NIKKOR 400mm f/2.8D IF-ED II No limitations 1949 AF-S NIKKOR 400mm f/2.8D IF-ED No limitations 1948 AF-I NIKKOR 400mm f/2.8D IF-ED No limitations 2172 AF-S NIKKOR 500mm f/4G ED VR Autofocus not possible 2131 AF-S NIKKOR 500mm f/4D IF-ED II Autofocus not possible 1937 AF-S NIKKOR 500mm f/4D IF-ED Autofocus not possible 1941 AF-I NIKKOR 500mm f/4D IF-ED Autofocus not possible 2173 AF-S NIKKOR 600mm f/4G ED VR Autofocus not possible 2133 AF-S NIKKOR 600mm f/4D IF-ED II Autofocus not possible 1952 AF-S NIKKOR 600mm f/4D IF-ED Autofocus not possible 1951 AF-I NIKKOR 600mm f/4D IF-ED Autofocus not possible 2185 AF-S NIKKOR 70-200mm f/2.8G ED.