aperture, finder, optical prism, prism, viewfinder, view finder

optical telescope, observatory, astronomers, refracting telescope, astronomical telescope, spectrometer, spectrograph, interferometer, astronomy, spacecraft, satellites, planetarium, deimos, cassini, stargazer, photometer, coronagraph, retroreflector, comet, quasars, andromeda galaxy, epsilon aurigae, infrared, hubble, eyepiece, astrometry, cosmic ray, radial velocity, earthshine, huygens, orbiter, astrophotography, themis, proxima centauri, exoplanet, herschel, polarimetry, lander, jodrell bank, imager, radiometer, spectroscopic, celestial sphere, electron microscope, newtonian telescope, flyby, seismometer, milky way galaxy, harlow shapley, omega centauri, rover, bolometer, grond, asteroid, edwin hubble, photometry, galaxies, astron, binoculars, refractor, meteor shower, kepler, synchrotron, small magellanic cloud, planck, airglow, parabolic mirror, alpha centauri, moon, arecibo, microscopes, pulsars, supernova, selene, attosecond, extragalactic, eclipsing binary, aurora, particle accelerator, smos, occultation, astrophysicist, fomalhaut, starlight, reflector, planets, large magellanic cloud, antenna, gamma ray, zodiacal light, redshift, constellation, optics, arcsecond, geosynchronous orbit, orbit, corot, meteorite, cyclotron, nightglow, aurora borealis, ionosphere, telescopes, derrick, microscope, lathe, cooker, airship, boiler, aerial, engine, kiln, magnet, propeller, refrigerator, spectroscope, stills, culture, fable, >, behind, calendar, chair, chart, cod, difference, dynamite, fly, height, how, hut, instrument, judgment, law, list, m, myth

collimator, solar telescope, transit instrument

., alidad, alidade, astronomic, astronomical telescope, astronomy satellite, cassegrainian telescope, coelostat, collimation, collimator, coude system, coude telescope, david rittenhouse, dumpy level, extended, field glass, galilean telescope, galileo, galileo galilei, glass, gregorian telescope, herschelian telescope, maksutov telescope, newtonian reflector, newtonian telescope, off-axis reflector, open sight, optical telescope, radio brightness, radio interferometer, radio observation, radio reflector, radio telescope, reflecting telescope, reflector, refracting telescope, resolution, resolving power, rittenhouse, schmidt camera, schmidt telescope, solar telescope, spyglass, surveyor's level, telescope sight, telescopic sight, theodolite, transit, transit instrument

concentrate, condense, crush, magnifier, mash, squash, squeeze, squelch

scope