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: MetalMount: 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 SL1Focal Length: 420-800mm zoom lensAperture: f/8.3 #64;420mm-f/16 #64;800mmOptical Constructions: 4 elements in 2 groupsZoom System: Linear push-pullExposure: Automatic exposure is available in Aperture Priority mode only for cameras with TTL metering systems; Other camera must be set in full manualFocusing: Manual helical(rotary) operation(Not AF compatible)Minimum Focusing Distance: 1.6 meters(5.25ft) from front lens elementFilter Size: 62mmDiameter: 69mmLength: 24-35cm / 9.45-13.38in(with caps)Lens Dimension: 24 * 7 * 7cm / 9.45 * 2.76 * 2.76inAdapter Ring Dimension: 6.5 * 6.5 * 1.7cm / 2.56 * 2.56 * 0.67inWeight: 659g / 18.3ozPacking List:1 * Super Telephoto Zoom Lens1 * T-mount Adapter Ring1 * Front Cap1 * Rear Cap1 * Carrying Pouch