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TeleconverterTelephoto lensOptical attenuatorDouble-gauss lensPhotographic filterAdaptive opticsRefracting telescopeExtension tubeCondenserMeniscus correctorOptical instrumentElectro-optic modulatorEnlargerOpto-isolatorEyepieceCamera lensPrime lensOptical comparatorOutput couplerAchromatic lensReflecting telescopeTelescopic sightApochromatRelay lensOptical amplifierImage stabilizationOptical telescopeCompressorOptical transistorHydrogen compressorAstronomical filterOptical microscopeOptical coatingAutofocusSchmidt corrector plateAnti-reflective coatingLens antennaDiffuserLong-focus lensCorrective lensC mountMonochromatorPhotoelastic modulatorOptical filterGraduated neutral-density filterCamera stabilizerPolarizerScroll compressorFrequency changerTorque amplifierBarlow lensNeutral-density filterOptical spectrometerCatadioptric systemFiber-optic cableConfocal microscopyPolarization controllerOptical isolatorLens hoodBellowsFocusing screenCompactorOptical circulatorCompact linear fresnel reflectorCycloidal driveDigital single-lens reflex cameraCylindrical lensLens mountStereoscopyInterference filterPrismMicrographFiber-optic sensorRangefinder cameraAutorefractorCompression driverElectronic viewfinderHigh-pass filterCellular repeaterCentrifugal-type superchargerFocal-plane shutterElectro-absorption modulatorDark-frame subtractionRotary converterAutocollimationSuperchargerDichroic filterTripod headFiber-optic splitterAutocorrelatorOptical ring resonatorsFiber-optic patch cordMovie cameraPower conditionerThermal weapon sightDigital movie cameraLaser rangefinderEffects unitDifferential amplifierOptical parametric amplifier