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SkyMaster Pro ED binoculars are the ideal choice for amateur astronomers. With the large 80 mm objective lenses, BaK-4 prisms, ED Glass, and Celestron's proprietary XLT coating technology, the view through a SkyMaster Pro ED is second to none at this price point. The 80mm objective lenses have tremendous light-gathering capabilities, delivering superior low-light performance, even in the dimmest conditions. The Extra-Low Dispersion (ED) glass virtually eliminates chromatic aberration, also known as color fringing, a visual defect common in binoculars delivering edge-to-edge sharpness with excellent color correction and razor-sharp images. SkyMaster Pro ED's eyepieces are threaded to accept standard 1.25" astronomical eyepiece filters to deliver game-changing views. The SkyMaster Pro ED 20x80 mm's built-in tripod adapter allows the binocular to be attached to a tripod for added stability and acts as a balance rail by sliding along the center support rod, perfect for connecting a red-dot finderscope. Once you align it with the binocular, the red-dot finderscope will help you pinpoint your target in seconds. The polycarbonate and aluminum housing allows the binocular to be lighter weight without sacrificing its durability. The protective rubber armor is extremely rugged and durable and can handle demanding use. The fully waterproof housing for all weather conditions provides peace of mind when unexpected weather occurs. The housing is also filled with dry nitrogen gas to prevent the internal lenses from fogging when moving between extreme temperatures or using the binocular in damp conditions. Bring distant objects into view with 20x magnification—great for observing celestial objects in greater detail, searching for wildlife in the brush, or viewing a distant object on the horizon.