Pentax 62555 8x42 DCF CS Binoculars (Black) Waterproof and nitrogen-filled (JIS Class 6) to handle the most extreme weather conditions (submersible to 1m). Phase coated roof prisms provide high resolution, high contrast images. Silver-deposited roof prisms reflect more light through the prism for a brighter image. Fully-multi-coated optics provide the maximum light transmission and reduced internal reflections. Long eye relief for comfortable viewing with or without glasses.