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Parabolic reflectorSpherical mirrorPlane mirrorReflectorLiquid mirror telescopeSpeculumIon mirrorReflecting telescopeParhelionSubreflectorRefractorFold sphereCassegrain reflectorReflecting circleNewtonian telescopeNasmyth telescopeSpherocylinderSchmidt telescopeCassegrainCatoptronChromatoscopeHeliographCamera obscuraAsphereScioptic ballSubspheroidPhototelescopeApochromatSematropeParhelic circleEllipsoidAdaptive opticsPerspective glassAutocollimationSpyglassRefracting telescopeHeliostatTelescopeMonoscopeSpheroidalSpherical aberrationGravitational lensBarlow lensBarlensSolar telescopeConcaveHolophotePlanisphereParabolic cometSuperlensOlbers' paradoxAnastigmatParheliumRadio telescopeSphericuleTerrestrial telescopeGalilean telescopeAstrographHubbleMonogonHoropterCoronagraphSunshieldEinstein ringVirtual focusBarred spiral galaxyNight glassImage spaceCircleOblique sphereOrthoSpheroidOptical doubleCoronographBarlowSubhelic arcParallaxAstroidDisco ballAstigmatismMirror ballAstrointerferometerOrbital planeEllipticalCircumhorizontal arcStar projectorTelestereoscopeNewton's ringsOpticSolar microscopeGlobeSphericleSolar sailMaksutov telescopeInspiralHemispheroidHoroballPeribaryonParanthelionEarthlight