Binoculars and all purpose telescopes
Describes the structure and special features of a variety of binoculars and telescopes and discusses the use of these instruments for studying birds, stars, architecture and in other activities.
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8-power achromat actually alignment aperture aperture stops astronomical Bausch & Lomb binoc bird Bushnell camera catadioptric Celestron coated color compact degrees diameter distance distant object edge error Ex Ex Ex Ex Ex VG Ex G Ex VG G exit pupil eyecups eyepoint F VG feet field glass field of view field width film focal length G Ex G VG VG Hensoldt higher powers hunting illustrated inches instruments Leitz lenses look magnification ment millimetres mirror misalignment models monocular moon objective lens ocular optical system ounces Photo courtesy photograph pocket glasses porro prism prism binoculars Questar range roof prism scene separation sharp shown in Fig Spacemaster spotting scope standard star surfaces Swift swing target tele telephoto telephoto lens telescope tion tive tripod types ular uncoated VG Ex Ex VG F F VG VG Ex weight wide-angle zoom