Celestron SkyMaster Pro 20x80 binoculars are the ideal choice for amateur astronomers or anyone that observes at great distances. Compared to lower-priced large aperture binoculars, SkyMaster Pro uses superior optics, coatings, internal parts and housing materials. With large objective lenses, BaK-4 prisms and fully multi-coated optics utilizing Celestrons proprietary XLT coating technology, the view through a SkyMaster Pro 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. Choose SkyMaster Pro for use at dusk, dawn and nighttime astronomical viewing. Every air-to-glass surface is multi-coated with Celestrons proprietary XLT coating technology. These coatings coupled with BaK-4 prisms increase light transmission through the optical path and deliver crisp, high contrast images with outstanding resolution. Filter threads on the eyepieces allow you to attach standard 1.25 filters to SkyMaster Pro. These filters can minimize the effects of light pollution, reduce the brightness of the moon or diminish glare when looking over water. The binocular also includes both standard and winged rubber eyecups. When lighting conditions are not ideal and there is a lot of glare or light entering from the side, switch to the winged eyecups to block this light and improve the view. The built in tripod adapter of the SkyMaster Pro 20x80 not only allows the binocular to be attached to a tripod for added stability but it also acts as a balance rail by sliding along the center support rod. A red-dot finder can also be attached to the center support rod utilizing the removable rail. When properly aligned with the binocular, the red-dot finder will allow objects to be brought into view quickly. The polycarbonate and aluminum housing allows the binocular to be lighter weight without sacrificing its durability. The housing with protective rubber armor is extremely rugged and durable with the ability to handle tough use. The fully waterproof housing for use in all weather conditions provides peace of mind when unexpected weather rolls in. The housing is also filled with dry nitrogen gas to prevent the internal lenses from fogging when moving between extreme temperatures or when using the binocular in damp conditions. Bring distant objects into view with 20x magnificationgreat for observing celestial objects in greater detail, searching for wildlife in the brush or viewing a distant object on the horizon.