Built using aerospace-grade metal and hand polished glass, the Moment 58mm Tele Lens provides 2x optical magnification when mounted over the camera lens of a single-lens phone or the wide camera of a multi-lens phone, as well as 4x optical magnification when mounted over the iPhone's telephoto lens using the Moment Pro Camera app. Built using a six-element design in four groups, this lens excels in portrait, landscape, travel, and sports photography.