control the super focal zoom from DSLR SLR cameras. 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. 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. Ultra Multi Coating: Adopts multi-coated technology to reduce flare and ghost to get vivid color and clear images. Premium optical glass lens provides high light transmittance. 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. 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 Packing List: 1 * Super Telephoto Zoom Lens 1 * T-mount Adapter Ring 1 * Front Cap 1 * Rear Cap 1 * Carrying Pouch