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F numberSpeedStop numberFocal lengthFocalizationFocalisationFocalizeFocal pointZoom lensFocuserFresnel lensOptical lensTelephoto lensAspect ratioAfocalLensometerApertureTelephotoAutofocusCamera lensDefocusFisheye lensLensingFocussingEyepieceFlux densityDiopterVignettingIn focusViewfinderLensesStereometryGear ratioLenseFovealFocussesFocusingResolutionRefractiveCamera angleOpticsMagnificationLensedReflex angleFoveaDioptersCollimatedPhotometricStereoscopyCameraPhase angleStereopsisProportionPhotographyRefractive indexCollimatorFovea centralisAchromatic lensAstigmatismVergenceGolden ratioSelective focusCritical angleFresnelAnastigmatDimensionsHyperopicCollimationHyperopiaStereoscopicFrequency responseAnamorphicCurvatureCompression ratioLight meterRefractionPentaprismRefractorFocussedTelescopeReticleConfocalDioptricAsphericalProportionsFocusesDiameterOpticalPhotographScale factorParfocalPhotographicVisual acuityPhotometerFundamental frequencyPentaxSharpnessFocusedFoveolaChromatic aberration