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BarlowGravitational lensTelescopeAdaptive opticsRefractorSuperlensBarlensRefracting telescopeCollimatorReflecting telescopeOpticNewtonian telescopeGalilean telescopeOptical doubleMacrolensingCassegrain reflectorNight glassGravitational lensingSchmidt telescopeReflectorHoropterDobsonian telescopeBinoscopeLiquid mirror telescopeSpherical aberrationDobsonianDiopteric aberrationPhototelescopeDiffraction limitFocusOrthoOptical astronomyCassegrainVirtual focusHubbleSubreflectorSpyglassTerrestrial telescopeApertureNasmyth telescopeHelioscopeLight bucketPerspective glassFinderscopeScioptic ballField of viewFlexureDrawtubeSolar telescopeGalilean binocularsAstrointerferometerAnastigmatMonocularFocal pointLateral aberrationMaksutov telescopeParabolic mirrorAstigmatismSolar microscopeApochromatDefocusTelestereoscopeSpeculumEinstein crossVery-long-baseline interferometryRadio telescopeAstrographEyepointAutocollimationOcculterParallaxUniversal instrumentSpherocylinderTrinocularsMonoscopeAberrationMultiple starParabolic reflectorComet-finderCoronographHypergonBlazarFirst lightDepointingCoronagraphEquatorialDigressionHypertelescopeHolophoteNullerSchmidt cameraBlack drop effectChromatoscopeAberration of lightImage spaceFar pointDerotatorHubble diagramHubble's lawCatoptron