The Celestron powerseeker 40az telescope (Telescope for Astronomical & Land observing, 40 mm Aperture, 94x magnification REVEAL THE DEPTHS OF OUR SOLAR SYSTEM AND THE WONDERS OF NATURE. A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescopes were invented in the netherlands at the beginning of the 17th century, using glass lenses. They found use in terrestrial applications and astronomy. Overview: sharp image optics for land observing. Quick and easy no tool set up, perfect for beginners fully coated glass optics with high transmission coatings for enhanced image brightness, contrast and clarity 2x barlow lens which doubles the magnifying power of each eyepiece. The skyx firstlight astronomy software/ cd. Description: amateur astronomy is a great family hobby that can be enjoyed year round, and Celestron's powerseekers are the ideal choice for families looking for telescope that will provide many hours of enjoyment for children and adults alike. The powerseeker series is designed to give the first-time telescope user the perfect combination of quality, value, features and power. The model feature sharp image optics for astronomical and land viewing. Specifications: aperture (mm) 40 mm (1.57 in) focal length 500 mm (20 in) focal ratio 13 focal length of eyepiece 1 (mm) 8 mm (0.31 in) magnification of eyepiece 1 63 x focal length of eyepiece 2 (mm) 20 mm (0.79 in) magnification of eyepiece 2 25 x barlow lens 2 x finderscope 2x20 mount type altazimuth highest useful magnification 94 x lowest useful magnification 5.71 x limiting stellar magnitude 10.5 resolution (Rayleigh) 3.48 arc seconds resolution (Dawes) 2.9 arc seconds light gathering power (Compared to human eye) 33 x optical coatings fully coated