'Celestron AstroMaster 130 EQ Telescope needs a quick and easy no-tool setup. It is permanently mounted StarPointer. You are able to see erect image optics - ideal for terrestrial and astronomical use. The quick release dovetail attachment makes setup easier. It has German Equatorial mount with setting circles which help you to accurately locate and track sky objects. The rugged pre-assembled tripod with 1.25 inch steel tube legs delivers a rigid and stable platform. Celestron AstroMaster 130 EQ Telescope is a dual-purpose telescope appropriate for both terrestrial and celestial viewing. It is capable of giving correct views of land and sky. With its help you can see bright, clear images of the Moon and planets. For visions of the brighter deep space objects like galaxies and nebulae, choose the larger aperture and light gathering ability of the Newtonian reflectors. You get all coated glass optics for clear, crisp images. It also has u00e2u20acu0153TheSkyX u00e2u20acu201c First Light Editionu00e2u20acu00c2u00c2u009d astronomy software with a 10,000 object database, printable sky maps and 75 enhanced images. It has 130 mm aperture . Aperture (the diameter of the lens or mirror) is the single most significant factor determining the performance of a telescope. The bigger the aperture, the more light your scope gathers and the higher resolution (ability to see fine detail) it has. The clear aperture of a telescope is the diameter of the objective lens or primary mirror, specified in either inches or millimetres. Doubling the aperture means doubling resolution and quadrupling light gathering power. This means that an 8-inch scope can see things that are only one-fourth as bright as the limit of a 4-inch scope and details that are only half as big as the best that the smaller scope can resolve. The Focal Length is 650 mm . A focal length is the distance from a telescopeu00e2u20acu2122s objective element (lens or primary mirror) to the point where rays of light from the objective converge to a focus. It is measured in inches or millimetres. Longer focal lengths will have more capacity for high magnification but thinner fields of view than shorter focal lengths. For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope when using the same eyepiece. It has 307 x magnification . This value is highest useful magnification allowed by this optical system. Magnification of a telescope is essentially a relationship between two independent optical systems u00e2u20acu201c the telescope itself and the eyepiece you are using. To determine power, divide the focal length of the telescope (in mm) by the focal length of the eyepiece (in mm). By exchanging an eyepiece of one focal length for another, you can increase or decrease the power of the telescope. For example, a 25mm eyepiece used on a 1250mm focal-length telescope would yield a power of 50x (1250/25 = 50) and a 10mm eyepiece used on the same instrument would yield a power of 125x (1250/10 = 125). Since eyepieces are interchangeable, a telescope can be used at a variety of powers.'