I bought this but never used it after opening the box. The box is torn. Thank you. Maximum focal length: 42 mm Minimum focal length: 28 mm 【18mm Wide-Angle Lens】 The 18mm wide-angle lens has a 0.75x magnification and attaches to the main camera of your smartphone, allowing you to capture clear and sharp photos with a 100° field of view (FOV) and creative edge distortion. It's perfect for various scenes such as wildlife, natural landscapes, cityscapes, concerts, and group photos. 【Anti-Reflection Coating】 The lens features multiple high-quality anti-reflection (AF) coatings, minimizing lens flare while achieving accurate color reproduction. 【17mm Threaded Lens Clip】 The wide-angle lens attaches to the main camera with a smartphone lens clip and is secured with a 17mm screw. It has a 28mm adjustable aperture and is compatible with iPhone 17 series, 16 Pro Max, 15, 14, 13 Pro Max, Android, and Galaxy S25 Ultra, and can also be used with NEEWER smartphone cages/cases and 17mm lens mount screw backplates. 【Excellent Optical Structure】 The HD optical glass has a 5-group, 6-element optical configuration, which prevents chromatic aberration and distortion while increasing light transmission. It is the perfect lens attachment for content creators as an essential smartphone camera shooting accessory kit and for influencers as essential shooting equipment. 【Lightweight & Sturdy】 The lightweight lens attachment uses an aluminum alloy shell. Note: Please clean the main camera and adjacent cameras before use. If vignetting occurs, tighten the lens and set the camera zoom to 1.1x or higher.