1、Applicability: The lens interface adopts a 17mm thread design, which can be used for most smart phones with a metal mounting clip, or you can buy a special phone case with a 17mm thread mounting aperture. 2、Clear Image: The mobile phone lens adopts premium optical glass, 11 groups and 11 pieces of optical structure design, BAK4 prism and manual focusing, which has high transmittance, clear image, and experience the fun of SLR. 3、Aluminum Alloy Lens Barrel: The lens barrel is made of premium aluminum alloy, which has fine workmanship, durability and comfortable feel. Red base with 1/4in screw hole is compatible with tripod. 4、Background Blur Effect: The background blur effect is good, which can create a particularly shallow depth of field effect. The focus is clear and incisive, and the background outside the focus is soft and beautiful, bringing better artistic beauty. It can be used in portrait photography, scenery, tourism, flowers, insects, still life, etc. 5、Practical: For iPhone as a reference, the equivalent 50mm focal length effect can be achieved after installing the phone lens, which is visually the same as the SLR camera equipped with a 50mm fixed focus lens (Because the phone lens is an additional lens, the actual imaging focal length is related to the original focal length of phone). 1 x Mobile Phone Lens2 x Protective Cover(Installed)1 x Clip1 x Instructions Item Type: Mobile phone lensMaterial: Aluminum alloy, optical glassWeight: Approx. 437g/ 15.4ozOptical Structure: 11 groups and 11 piecesEquivalent Focal Length: 50mm/2inOptical Distortion: ＜ 3%Focusing Mode: Manual focusing 15-20mm/ 0.6- 0.8inLens Interface Thread Specification: 17mm/ 0.7in