1. Control the super focal zoom from DSLR SLR cameras. 2. T-Mount to EF-Mount Adapter Ring: T mount lens with adapter ring, replacement for Canon EF-Mount Cameras 80D 77D 70D 60D 60Da 50D 7D 6D 5D T7i T7s T6s T6i T6 T5i T5 T4i T3i T3 T2i SL2 SL1. 3. Functional Structure: The lens consists of 4 elements in 2 groups, with lock to fix the lens for precise shoot. Whole metal structured body provides with tough and durable constructions. 4. Ultra Multi Coating: Adopts multi-coated technology to reduce flare and ghost to get vivid color and clear images. Optical glass lens provides light transmittance. 5. Universal 1/4 Mounting: The base with 1/4 screw thread down the lens makes wide application on tripod and monopod, the base with ring can rotate, convenient to install in seconds. 6. Specifications: Color: Black/ White(optional); Material: Metal; Mount: T mount(T2); Replacement for: Canon EF-Mount Cameras EOS 80D 77D 70D 60D 60Da 50D 7D 6D 5D T7i T7s T6s T6i T6 T5i T5 T4i T3i T3 T2i SL2 SL1; Focal Length: 420-800mm zoom lens; Aperture: f/8.3 #64;420mm-f/16 #64;800mm; Optical Constructions: 4 elements in 2 groups; Zoom System: Linear push-pull; Exposure: Automatic exposure is available in Aperture Priority mode only for cameras with TTL metering systems; Other camera must be set in full manual; Focusing: Manual helical(rotary) operation(Not AF compatible); Minimum Focusing Distance: 1.6 meters(5.25ft) from front lens element; Filter Size: 62mm; Diameter: 69mm; Length: 24-35cm / 9.45-13.38in(with caps); Lens Dimension: 24 * 7 * 7cm / 9.45 * 2.76 * 2.76in; Adapter Ring Dimension: 6.5 * 6.5 * 1.7cm / 2.56 * 2.56 * 0.67in; Weight: 659g / 18.3oz. 7. Packing List: 1 * Super Telephoto Zoom Lens; 1 * T-mount Adapter Ring; 1 * Front Cap; 1 * Rear Cap; 1 * Carrying Pouch.