Usogood 10X42 Monocular Telescope High Power, Monoculars for Adults with BAK4 Prisms and FMC Lens, Compact Waterproof Monocular for Bird Watching Hiking Camping with Hand Strap BlackHD Bright ImageThe high quality BAK4 prism and FMC multi layer green film have a light transmittance as high as 99. 9%, which reduces distortion, chromatic aberration, and ghosting, and provides ultra clear images even in low light environments. Excellent for bird watching, near (3. 3 yards of garden) or far (1200 yards of sky). Portable and LightweightThe monoculars for adults have the compact size and weight of a smartphone, come with a carry case,