★【high quality optics & Low Light Night Visio& FMC coating and BAK-4 prism】ZIYOUHU binocular uses the BAK4 green coated and FMC Lens,its FMC(fully coated lenses) film aspheric lens provides superior light transmission, providing you with high definition vision, brighter field of view and true color images.It can be used at night,50mm lenses are larger than usual to give lots of light-gathering power, so the more effective they will be in low light. Deliver clear vision in weak light condition.