Ideal Fit: These binoculars are an ideal choice for amateur astronomers or anyone who observes at great distances Versatile Use: The threaded eyepieces accept all standard 1.25-inch astronomical eyepiece filters to bring out details or reduce the effects of light pollution ED Objective Lenses: The Celestron SkyMaster Pro ED binoculars feature Extra-Low Dispersion (ED) glass that virtually eliminates chromatic aberration, also known as color fringing, a visual phenomenon common in magnified optical systems