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FOREWORD by Arthur Frank F B O
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achromatic advantage altitude amateur astronomer axle azimuth Barlow lens beam binoculars bright camera Cassegrain Catadioptric Systems centre of curvature colour concerning considerable construction coronograph curved detail diagram diameter disc distance effect ensure equatorial extremely eye-lens eyepiece field of view flat focal length focal plane focus focussed greater Gregorian heliostat high power inch telescope increase instru instrument large telescope lenses light light-grasp low-power eyepiece lunar magnification magnifying power main mirror Maksutov Maksutov Telescope means ment modification Moon mounting Newtonian non-achromatic object object glass observatory observer obtained one-inch telescope optical axis optical surfaces optical system out-of-focus paraboloid peepsight photographic planetary plate position possible prism purpose Ramsden Ramsden disc rays reason reflecting telescope refracted refractor result Right Ascension rotation Schmidt scope seen simple small telescope solar specialised spherical aberration star sufficient suitable tele telescope tube terrestrial tion vignetting wide field