Nikon 6490 ACULON 8x21 T01 Binocular (Red) Turn-and-slide rubber eyecups facilitate the easy positioning of eyes at the correct eye-point and allow for comfortable viewing during extended periods of use. Multicoated lenses mean that images are going to be bright, rich with color and full of detail. The ACULON T01 binoculars are designed to be as light as possible along with excellent ergonomics. This assures you will be comfortable and steady throughout extended periods of use.