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 multi‑layer MC coating. 4. It has a 420‑800mm/16.5‑31.5inch ultra‑long zoom, and with a 2X teleconverter, the focal length range becomes 840‑1600mm/33.1‑63inch. 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/37.3oz 420-800mm Lens Parameters: Item Type: Telephoto Lens Material: Plastic + Aluminum Alloy + Optical Glass Focus Mode: Full Manual Focus Focal Length: 420-800mm/16.5‑31.5inch Aperture: F/8.3-16 Front Filter Diameter: 67mm/2.6inch Anti-shake Function: None Applicable Models: for F Mount Camera (need to Install the Standard Adapter Ring to Use) 2X Teleconverter Parameters: Material: Plastic + Aluminum Alloy + Optical Glass Coating: MC Coating Interface: T2 Mount Magnification: 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)