Specification:MaterialAluminium, plasticLens connectorM17*P0.75Lens coatingMulti-layer coatingLens construction8 lenses in 5 groupsFocusing5m~∞Viewing angle4.4°-8.8°Optical magnification20X-40XLens length178mmDevice supportCompatible with most smart-phonesFeatures:1. This is a new designed high qual..