Celestron 20×80 Skymaster Binoculars

Celestron SkyMaster 20 x 80 Binoculars When it’s time to gaze at the stars or take in some long-distance or low-light terrain viewing look no further than the Celestron 71018 SkyMaster 20 x 80 binoculars. Featuring high quality BAK-4 prisms multi-coated optics for enhanced contrast a diopter adjustment for fine focusing and large apertures these binoculars offer phenomenal performance. The Celestron 71018 features a 20x magnification and an objective lens diameter of 80 millimeters giving it a 4-millimeter exit pupil. The exit pupil size – the diameter of the objective lens divided by the magnification – determines the amount of light available to your eye. The larger the exit pupil the brighter the image obtained will be. A three-millimeter exit pupil is generally sufficient for daytime use five-millimeters is suitable for daytime and twilight and seven-millimeters is generally necessary for maximum nighttime or astronomy use. The Celestron 71018 also includes an integrated tripod adapter rod a deluxe padded soft carrying case.