The Opteka 650-1300mm high definition manual focus super telephoto zoom lens is perfect for the specialist as well as amateur professional photographer alike. Using a 2x tele-converter with a 650-1300mm lens will successfully enhance the focal length to 1300-2600mm. It's a very effective telephoto zoom lens with the adaptability that you require.
650-1300mm f/8 manual focus telephoto lens compatible with full-frame sensors as well as APS-C sensors
2x Teleconverter doubles the power of your lens to 1300-2600mm
8 Lens elements in 5 groups, low-dispersion multi-coated HD optical glass to reduce flare
Built-in tripod collar for improved lens balance
Kit includes 650-1300mm super telephoto zoom lens, 2x doubler, t-mount, case, front and rear caps, 10 year warranty