18 mm eyepiece binoculars, larger image, clearer details 2.25 times as large as the image size of a 12 mm eyepiece (e.g. 10x25, 12x25, 10x21 binoculars), 1.28 times 16mm eyepiece (e.g. ordinary binoculars 10x42, 12x42). The large eyepiece binoculars use 12x magnification, provide a larger image and ensure clearer details16.5 mm BAK4 prism binoculars, super bright, clear view: Collects 32 percent more light than 12.5 mm prism lenses (e.g. 10x25, 12x25, 10x21 binoculars), 13.7 percent of the 14.5 mm prism lenses (e.g. ordinary Binoculars 10x42, 12x42). 16.5mm prism lens takes advantage of the 42mm objective lens, collects more light, provides brighter visionPowerful 12 x 42 binoculars for adults weighing only 0.6 kg. Weighing just 560 g, Adasion delivers 12 x 42 mm binoculars 112 m or 1000 m field of view. Perfect binoculars for bird watching, hunting, sporting events. Binoculars with adjustable eyecups, suitable for people who wear glasses.Binoculars with cell phone adapter, enjoy taking photos: Quick alignment, compatible with cell phone case, portable and stable. Suitable for iPhone X, 8P, 8, 7P, 7, 6, 6S, 6P, 5, 5S, Samsung Galaxy S8, S7, S6, S6 Edge, S5, Note, Huawei, LG, HTC, Sony, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.