Feature:1. The lens itself is a T2 mount, which can be installed on the telescope to observe the moon, etc. Through the standard adapter ring, it can be installed on the for camera for shooting distant objects.2. Fuselage is made of premium aluminum material, which has delicate texture.3. Manual focusing adjustment, optical glass multilayer MC coating.4. It has a 420800mm/16.531.5inch ultralong zoom, and with a 2X teleconverter, the focal length range becomes 8401600mm/33.163inch.5. Telephoto lenses are good for shooting distant scenery, wildlife, concerts, bird observation, etc.6. Its ultra powerful 2X Teleconverter, which can double the focal length or magnification.Specification:Weight: Approx.1058g/37.3oz420-800mm Lens Parameters:Item Type: Telephoto LensMaterial: Plastic + Aluminum Alloy + Optical GlassFocus Mode: Full Manual FocusFocal Length: 420-800mm/16.531.5inchAperture: F/8.3-16Front Filter Diameter: 67mm/2.6inchAnti-shake Function: NoneApplicable Models: for F Mount Camera (need to Install the Standard Adapter Ring to Use)2X Teleconverter Parameters:Material: Plastic + Aluminum Alloy + Optical GlassCoating: MC CoatingInterface: T2 MountMagnification: 2X.Package List:1 x Lens1 x Front Lens Cover (Installed)1 x Rear Lens Cover (Installed)2 x Storage Bag1 x Adapter Ring1 x Wrench1 x 2X Teleconverter (Lens Cover Installed)