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AplanatismApochromatDiopteric aberrationSpherical aberrationAstigmatismAnastigmatAdaptive opticsLateral aberrationAberrationChromatosphereSpherocylinderAberration of lightAnticoronaAnomalyApofocusAstrophotonicsAstronomicsSpectroheliographOptical spectrumMonogonChromatoscopeRefractorPlanetary aberrationExodriftVirtual focusPhotometeorOptical astronomyHypergonEyepointArago spotAposaturniumOpticSpectroastrometryFocal pointAsphereDiurnal aberrationApoastronAstrophotometryMacrolensingHoropterGalilean binocularsPhotometryAstrophilosophyApocenterDepointingCircumhorizontal arcAntitruncationCrown of aberrationOrthoCosmoramaSolargraphApocentreDiffraction limitSolar maculationApobaryonAutocollimationObliquityChromosphereScioptic ballSpectropolariscopeAnnual aberrationSuperlensAstronomyLens flareMonocularPolariscopyApertureOccular sparkApoareionApastronMicrovariabilityPseudophotosphereParanthelionBarlowAponigriconCoronagraphyLevorotationCompressionHolophoteUveovortexApokronAnticrepuscular rayApostilbParallaxPerifocusMonoscopeRainbowApoapsisCuspinessAnorthoscopeAntumbraApocatastasisMaksutov telescopeBolometric correctionEclipsationApapsisApocynthionParhelionDextrorotationStarlessness