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Celestron SkyMaster Pro 15x70 Binocular with Large Aperture for Long Distance Viewing GPS Tracking & Training Collars-12-2-7 2 black bookshelf speakers areSkyMaster Pro binoculars are the ideal choice for amateur astronomers or anyone that observes at great distances. SkyMaster Pro uses superior optics, coatings, internal parts, and housing materials compared to lower priced, large aperture binoculars. With large objective lenses, BaK 4 prisms, and fully multi coated optics utilizing Celestron's proprietary XLT coating technology, the view through a SkyMaster Pro is second to none at this price point.