From the Manufacturer: Celestron’s award-winning Nature DX binocular gets a major upgrade with the addition of ED objective lenses. Nature DX ED’s optical performance rivals that of more expensive binoculars, at a price to fit your budget. Generous 50mm objective lenses gather lots of light, making these binoculars an ideal choice when viewing conditions are dim, such as at dawn or dusk. With 12x magnification, this model is an excellent choice for long distance viewing or surveillance. ED Objective Lenses Extra-Low Dispersion (ED) glass virtually eliminates chromatic aberration, also known as color fringing, a visual defect common in binoculars. Nature DX ED delivers razor sharp images, even at the edges of the field of view. ED glass is also known for producing images with outstanding, true-to-life colour. Not all ED glass is created equal. Celestron’s high quality ED glass delivers visibly brighter, sharper images compared to non-ED binoculars. The difference is especially appa