Feature: 1. Adopts aviation‑grade aluminum alloy material, CNC tightly processed, and the cover is anodized, which is lightweight, durable, and corrosion‑resistant. 2. Can enhance the telephoto function, making the shooting focal length or magnification increased to 2 times the original. 3. The lens is made of high‑quality high‑definition optical glass material and double‑sided multilayer coating. 4. The lens is good for shooting distant scenery, such as wild animals, concerts, bird watching, etc. 5. Can be used with M42 lenses and used between SLR cameras and lenses. Specification: Condition: 100% Brand New Item Type: Lens Converter Color: Black Material: Aluminum Alloy + Optical GlassBayonet Type: M42-0.75mm T2 bayonet. Package List: 1 x 2x Converter1 x Front Lens Cover1 x Rear Lens Cover1 x Lens Storage Bag