Nikon ed意思

"ED" in Nikon lenses stands for "Extra-Low Dispersion" glass. This type of glass is used in lens elements to reduce chromatic aberration, which is a common optical issue where different colors of light focus at different points on the sensor or film plane. Chromatic aberration can result in a loss of image sharpness and color fringing along high-contrast edges in photographs.

ED glass is designed to minimize the dispersion of light, which means it reduces the amount of color fringing and improves the overall color accuracy and sharpness of the image. Nikon lenses that feature ED glass are generally considered to be of higher quality and are often used in professional and high-end consumer lenses.