All about Telescopes

ACHROMAT adjustment ALTAZIMUTH MOUNT ALUM ANGULAR APERTURE APPARENT FIELD astro BARLOW LENS CARDBOARD CENTER CLOCK DRIVE collimator CORRECTION Dawes limit DECLINATION SHAFT DIAGONAL diameter disk distance DRILL east EDGE OF FIELD EDMUND EQUATOR equatorial mount ERECTOR Example EXIT PUPIL EXPOSURE EYE RELIEF EYPC f/VALUE FIELD LENS film FILTER FINAL IMAGE FLANGE focal length focus FOCUSING TUBE GLARE STOP glass grinding HOLE HOUR ANGLE HOUR CIRCLE IMAGE PLANE inch INDEX KNIFE lenses light cone LIGHT RAYS magnification MAIN MIRROR MAIN TUBE MERIDIAN moon movement needed NEGATIVE LENS OPEN CLUSTERS optical parabola PARALLEL pedestal PIPE PLASTIC PLYWOOD POLAR AXIS POLAR SHAFT position PRIMARY IMAGE PRINCIPAL PLANES PRISM PROJECTION RADIUS RAMSDEN Ramsden eyepiece REFLECTOR refractor reticle right ascension rotation SCALE SCREW SETTING CIRCLES setup shown in Fig shows SIDEREAL sky objects solar sphere spherical STAR IMAGE STREET ELBOW stroke target telescope ZONE