Astronomy
Cassegrains are the ultimate take anywhere telescopes which are ideal for observing the Moon and Planets. They are available in apertures up to 8 inch and can normally be purchased either as an optical tube assembly, with an equatorial mount or as a computerised goto system.
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Dobsonian telescopes offer a fantastic aperture to price ratio, the largest light gathering capability for your money. The Dobsonian mount is a very simple but effective method of mounting a Newtonian Reflector, based on the Alt-Azimuth principle. The Dobsonian mount consists of a box type mounting which allows the telescope to pivot in altitude, whilst the box itself is rotated on a base in Azimuth. There are many variations available including standard OTA and collapsible OTAs and even motorised, auto tracking models.
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Newtonian reflector telescopes offer excellent value and give you a large aperture for your money. They use a concave objective mirror at the back of the tube and a secondary mirror which directs the light to the eyepiece. As the light rays are reflected off mirrors, rather than passing through glass, no false colour is produced.
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Refracting telescopes have an objective lens at the front of the tube with the light emitting through the back of the tube to the eyepiece. Since many observations are made high in the sky, a right angle diagonal is used to avoid neck strain. This also provides an upright image making them suitable for terrestrial observations. A refractor has several advantages over other telescope designs. The tube is enclosed so that dust and moisture do not enter the tube, and they do not have a central obstruction which reduces the light entering the tube. A refractor typically will give higher quality images of planets than other telescopes of similar aperture.
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