The Fujifilm Fujinon Polaris 7x50 FMTRC-SX Binocular offers superb optical performance and value. Ideal for astronomy, marine, and bird watching, this binocular deploys Fujinon's unique EBC coating, allowing 95% light transmission. With a field flattener lens, it offers edge-to-edge sharpness, free of any discernible astigmatism or distortion. Unique Light TransmissionThe EBC coating allows 95 percent of light to pass through the binocular making it great for low-light performance. DurabilityIt features a robust body with an airtight, waterproof structure, enabling use in harsh conditions from -20-degree-C to +50-degree-C. Designed with Long Eye ReliefThe Fujifilm Fujinon Polaris 7x50 FMTRC-SX Binocular features a long eye relief design with a maximum length of 23mm. Eye relief refers to the distance between one’s eyes and the eyepiece that still allows one to view the entire field of vision. Long Eye Relief binoculars allow one to see right up to the edge of the field of vision even while wearing glasses, with this distance at over 15 mm.