Amazon.com : Opteka 650-2600mm f/8 High Definition Ultra Telephoto Zoom Lens for Nikon D3000 D3100 D3200 D3300 D3400 D3500 Black : Electronics
Amazon.com : Ultimaxx 650-1300mm (w/ 2x Teleconverter 1300-2600mm) Telephoto Zoom Lens Set for Canon EOS 7D II, 6D II, 5D III, 5D IV, 5Ds, 1Ds, 80D, 90D, 77D, 70D, 60D, T7, T7i,