Photo Rig Camera AdapterAligns the phone lens with the binocular lens for photos and for videos. Reinforced cast aluminum frame keeps a tight grip on the binoculars, while spring loaded phone clamp, also of aluminum, holds the smartphone tight. Eyecup width between 24 46mm, which covers the spectrum of optics. Phone widths between 62 104mm will fit (iPhone 5 sans case is too narrow). Folds down to a small size that easily fits in pocket.