Feature:1. Super Telephoto Zoom Lens: The lens features manual focusing in F/8.316 aperture at 420800mm focal length, to separately 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 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 sturdy constructions.4. 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.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.Specification:Specifications:Material: MetalMount: T mount(T2)Replacement for: EF Mount Cameras 80D 77D 70D 60D 60Da 50D 7D 6D 5D T7i T7s T6s T6i T6 T5i T5 T4i T3i T3 T2i SL2 SL1FocalLength: 420-800mm zoom lensAperture: f/8.3@420mm-f/16@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) operating(Not AF compatible)Minimum Focusing Distance: 1.6 meters(5.25ft) from front lensFilter Size: 62mmDiameter: 69mmLength: 24-35cm / 9.45-13.38in(with caps)Lens Dimension: 24 * 7 * 7cm / 9.45 * 2.76 * 2.76inAdapter RingDimension: 6.5 * 6.5 * 1.7cm / 2.56 * 2.56 * 0.67inWeight: 659g / 18.3oz.Package List:1 * Super Telephoto Zoom Lens1 * T-mount Adapter Ring1 * Front Cap1 * Rear Cap1 * Carrying Pouch