Telescope/astronomical telescope suitable for indoor and outdoor This telephoto lens is a new mobile phone photography telephoto zoom lens, a full set of patented design magnification 20-40 times, all-metal lens body, optical glass coating + BK4 prism combination, high-definition resolution, clear contrast, and large-transparent light. The light effect is good. detachable screw fixed patent clip design, suitable for most smart phones, simple and convenient . Features: 1. Lens adopt prism type, that makes the lens more transparent, clear and bright. 2. The configure convenient storage bag more easy to carry and prevent to fall off when holding. 3. With pocket design, this will help you probable to take and single hand . 4. The focus capability makes the image clear and sharp. Lens parameters: Name: 20-40 zoom mobile phone lens set Device support: compatible with most smartphones Optical magnification: 20X-40X Viewing angle: 4.4°-8.8° Prism type: BAK-4 Lens structure: 8 elements in 5 groups Lens coating: multi-layer coating Focusing range: 5m~∞ Lens interface: M17*P0.75 Lens material: aluminum alloy and plastic Lens length: 178mm Used for: racing, beach, bird watching, boating/yachting, horse racing, hunting, outdoor activities, sports, theater, travel Package Contents: 1* 20-40 times telephoto lens 1* fixed ring 2* lens cap 1* Eye 1* 16X plastic clip 1* storage bag 1* manual 1* Lens cleaning cloth 1* Pit box packaging Note: Please understand because of the light irradiation or computer display difference, so I can't gu