Optical glass price references & details table

Which optical glass to choose for your optical components ? It depends mainly on optical glass optical characteristics but one should not overlook two other important points : optical glass price and optical glass availability.

Below you’ll find a comprehensive chart including most of the optical glass references, this chart is based on CDGM references and also includes Schott, Hoya and Ohara glass equivalents.

Optical glass price references

In the below chart, price reference base is the most common optical glass H-K9L/N-BK7 which have a reference value of 10. All the other glass reference price shows how much times they are more expensive (or less) than H-K9L. (for example H-FK61 have a relative price of 126, meaning it is 12.6 times more expensive that H-K9L.

Optical glass availability

Unlike float glass, optical batch are manufacturer in batch, these batches are scheduled several month in advance which means that in case on high demand some references availability maybe short. The availability that is shown in below chat is an information about the frequency of production of each reference and the existence of security stock.

Optical glass detailed table

Optical glass from CDGM and equivalents with price reference.
CDGM CodeCDGM TypendVdDensity (g/cm3)AvailabilityRelative PriceSCHOTT CodeSCHOTT TypeHOYA Code
HOYA TypeOHARA CodeOHARA Type
497816H-FK611.49781.613.7on stock80497816N-PK52A497816FCD1497816S-FPL51
497816H-FK61B1.49781.613.68on stock74497816N-PK52A497816FCD1B497816S-FPL51
457903H-FK711.456590.273.63common144457903FCD10
438945H-FK95N1.437894.523.52very common158(437-951)(FCD100)-439950(S-FPL53)
470669H-QK11.4704766.882.3low avaibility98
487704H-QK3L1.4874970.442.43on stock23487704N-FK5487-704FC5487702S-FSL5
500621H-K 11.4996762.072.47low avaibility126
500660H-K21.5004766.022.42low avaibility61500658BK4500-660BSC4500660BSL4
505647H-K31.5046364.722.4low avaibility61505650BK5
508611K4A1.5080261.052.4369
510634H-K51.5100763.362.47low avaibility51510635BK1510-634BSC1510636BSL1
511605H-K61.5111260.462.53low avaibility51511604K7511605C7511605NSL7
515606H-K71.5147860.632.54low avaibility51
516568H-K81.5160256.792.58low avaibility50
517642H-K9L1.516864.22.52on stock10517642N-BK7517-642BSC7516641S-BSL7
517642H-K9LGT1.516864.22.52on stock20517642N-BK7HT
517642H K9L*1.516864.22.52on stock7517642N-BK7517642BSC7516641S-BSL7
517642H-K9LA1.516864.22.51on stock10517642N-BK7517-642BSC7516641S-BSL7
518590H-K101.5181858.952.5common36518-590E-C3518590S-NSL3
526602H-Kll1.5263860.162.69low avaibility47526600BALK1526-601BACL1526600NSL21
534555H-K121.5335955.472.72low avaibility47534553ZK5534-554ZNC5534555ZSL5
522595H-K501.5224959.482.52low avaibility29522595N-K5522-595C5522598S-NSL5
523586H-K511.5230758.642.53on stock16523586C12523585NSL51
618634H-ZPK1A1.61863.393.61on stock70618634N-PSK53A618-634PCD4618634S-PHM52
603655H-ZPK2A1.60365.473.5very common84603655S-PHM53
593673H-ZPK31.5934967.293.36low avaibility190593-670PCD51
593683H-ZPK51.592868.344.29on stock97593-686FCD515
569713H-ZPK71.5690771.34.36very common169
530605H-BaK11.5302860.472.74low avaibility68
540597H BaK21.5399659.722.84uncommon24540597N-BAK2540-597BAC2540595S-BAL12
547628H-BaK31.5467862.782.84uncommon31548628BAL21
552634H-BaK41.5524863.372.9common29552635N-PSK3552-634PCD3552638BAL23
561583H-BaK51.5606958.343.01low avaibility33
564608H-BaK61.5638860.763.05common27564608N-SK11564-608BACD11564607S-BAL41
569560H-BaK71.5688356.042.83on stock10569560N-BAK4569-560BAC4569563S-BAL14
569560H-BaK7GT1.5688356.042.83on stock23569560N-BAK4HT
569561H-BaK7A1.5688356.122.84low avaibility13569560N-BAK4569-560BAC4569563S-BAL14
573575H-BaK81.572557.493.18common25573576N-BAK1573575BAC1573578S-BAL11
569630H-ZK11.5688862.963.06low avaibility46569631PSK2569-631PCD2569631BAL22
583595H-ZK21.5831359.463.24uncommon31583595SK12583-595BACD12583594S-BAL42
589613H-ZK31.5891361.253.26on stock11589613N-SK5589-613BACD5589612S-BAL35
589613H-ZK3A1.5891361.253.31on stock10589613N-SK5589-613BACD5589612S-BAL35
609589H-ZK41.6088158.863.53low avaibility33609589SK3609-589BACD3609590BSM3
611558H-ZK51.6111755.773.58low avaibility35611559SK8611-558BACD8611559BSM8
613586H-ZK61.6127258.583.54common22613586N-SK4613586BACD4613587S-BSM4
613604H-ZK7A1.6130960.363.41very common11
613606H-ZK71.6130960.583.51low avaibility13
614551H-ZK81.6140555.123.58low avaibility43614552SK9614-551BACD9614550S-BSM9
620603H-ZK9B1.6204160.343.58on stock10620603N-SK16620-603BACD16620603S-BSM16
620603H-ZK9A1.6204160.343.53common17620603N-SK16620-603BACD16620603S-BSM16
622567H-ZK101.622156.713.63low avaibility17
623569H-ZK10L1.622856.913.63common20623570N-SK10623-569E-BACD10623570S-BSM10
639555H-ZK111.6385455.453.69on stock10639554N-SK18639-555BACD18639554S-BSM18
603606H-ZK141.6031160.63.44on stock18603606N-SK14603607BACD14603607S-BSM14
617539H-ZK201.617253.913.66common26617539SSK1617539BACED1617540BSM21
623581H-ZK211.6229958.123.56on stock18623580N-SK15623-581BACD15623582S-BSM15
607567H-ZK501.6073856.653.54common26607567N-SK2607-567BACD2607568S-BSM2
607567H-ZK50GT1.6073856.653.54common36607567N-SK2HT
660574H-LaK11.659557.353.94low avaibility46660573LAK11660-573LAC11
692545H-LaK2A1.6921154.543.94very common34
747510H-LaK31.7469350.954.08low avaibility94
640602H-LaK4L1.6460.22.99very common53640601N-LAK21640-602LACL60640601S-BSM81
678555H-LaK5A1.677955.523.8common55678552N-LAK12678-555LAC12678553S-LAL12
694534H-LaK6A1.693553.383.59low avaibility78694533N-LAK13694-533LAC13694532S-LAL13
713538H-LaK7A1.71353.833.74on stock39713538N-LAK8713-539LAC8713539S-LAL8
720503H-LaK8A1.7250.283.88low avaibility74720506N-LAK10720-503LAC10720502S-LAL10
720503H-LaK8B1.7250.343.77low avaibility78720506N-LAK10720-503LAC10720502S-LAL10
651559H-LaK101.6511355.893.73uncommon50651559N-LAK22650-557LACL12651562S-LAL54
665546H-LaK111.6646154.614.02uncommon46
697562H-LaK121.696856.183.71uncommon66697562LAK24697565LAL64
652584H-LaK50A1.651658.43.5common68652585N-LAK7652-584LAC7652585S-LAL7
697555H-LaK51A1.696855.533.56on stock39697554N-LAK14697-555LAC14697555S-LAL14
729547H-LaK521.7291654.684.02on stock46729545N-LAK34729-547TAC8729547S-LAL18
755523H-LaK53B1.75552.324.22on stock55755523N-LAK33B755-523TAC6755523S-YGH51
755523H-LaK53A1.75552.324.39low avaibility116
734515H-LaK541.73451.494.01very common68734-511TAC4734515S-LAL59
691548H-LaK59A1.69154.823.94low avaibility63691547N-LAK9691-547LAC9691548S-LAL9
741526H-LaK611.74152.644.1low avaibility86741-526TAC2741527S-LAL61
670517H-LaK671.6751.73.73low avaibility77670516LAL53
517522H-KF61.5174252.152.47common36517-522E CF6517524S-NSL36
548458H-QF11.5481445.822.58common46548-458E-FEL1548458S-TIL1
548459QF11.5481145.872.9447
575415H-QF31.5750141.52.6uncommon41575415S-TIL27
575413QF31.5750241.313.1840
582420QF51.5821542.033.2235582421LF3582-420FL3582421PBL23
532488H-QF6A1.5317248.842.52common43532489N-LLF6532-488E-FEL6532489S-TIL6
532488QF61.5317248.762.7846
541472H-QF 81.5407247.232.54uncommon45541-472E-FEL2541472S-TIL2
541472QF81.5407247.22.8656
596392H-QF141.5955139.222.62low avaibility47596-392E-F8596392S-TIM8
581409H-QF501.5814440.892.6common41581-409E-FL5581407S-TIL25
581408H-QF50A1.5814440.752.61common41581-409E-FL5581407S-TIL25
581409QF501.5814440.893.23low avaibility28
567428H-QF561.5673242.812.62uncommon43567-428E-FL6567428S-TIL26
603380H-F11.6034238.012.63very common25603-380E-F5603380S-TIM5
603380F11.6034238.013.4320603380F5603-380F5603380PBM5
613370H-F21.61293372.65common27613370E-F3613370S-TIM3
613370F21.6129336.963.520613370F3613-370F3613370PBM3
617367H-F31.6165936.652.68low avaibility29
617366F31.6165936.613.5720617366Fil617366F4617366PBM4
620364H-F41.6200536.352.67on stock16620364N-F2620-363E-F2620363S-TIM2
620364F41.6200536.353.57low avaibility14620364F2620-363F2620363PBM2
624359H-F51.6243535.922.69low avaibility43
624359F51.6243535.923.6420621359PBM11
625356F61.6249535.573.625625356F7625-356F7
636354F71.6363635.353.7326636353F6636-353F6636354PBM6
626357H-F131.6258835.72.69low avaibility44626-357E-F1626357S-TIM1
626357F 131.6258835.73.6325626357F1626-357F1626357PBM1
640345H-F511.639834.462.76low avaibility46640-346E FD7640345S-TIM27
570495H BaF21.569749.452.82low avaibility61
580537H BaF31.5795753.713.14low avaibility61580539N-BALF4
583466H BaF41.5826746.62.91low avaibility57
583465BaF41.5827146.473.2845
606439H BaF51.6056243.882.97low avaibility77606437N-BAF4606437S-BAM4
608462H BaF61.6080146.23.11low avaibility57-609466(N-BAF52)
614400H BaF71.6141339.992.88low avaibility81
614400BaF71.6141340.033.5649
626391H-BaF81.6260439.072.96low avaibility64626390BASF1626-391BAFD1626392BAM21
622532H-ZBaF11.622353.173.57low avaibility43622533N-SSK2622532S-BSM22
640483ZBaF21.6396248.273.8341
657511H-ZBaF31.6569151.123.77uncommon29
664355H-ZBaF41.6642635.483.11low avaibility52664360N-BASF2
671473H-ZBaF51.6710347.293.58low avaibility38
667484H-ZBaF161.6667248.423.59common33667484BAFN11667-483BAF11667483S-BAH11
668419ZBaF171.6675541.933.845668419BASF6668-419BAFD6668419BAH26
702412H-ZBaF201.7015441.153.64very common28702410N-BASF52702-412BAFD7702412S-BAH27
723380H-ZBaF211.7234137.993.62very common28723380BAFD8723380S-BAH28
658509H-ZBaF501.6584450.853.77very common24658509N-SSK5658-509BACED5658509S-BSM25
683445ZBaF511.6827344.54.1437683445BAF50683-447BAF22683447BAH51
670472H-ZBaF521.6700347.23.57common29670471N-BAF10670-472BAF10670473S-BAH10
648338H-ZF11.6476933.842.73common21648338N-SF2648-338E-FD2648338S-TIM22
648339H-ZF1A1.6476933.892.79on stock19648338N-SF2648-338E-FD2648338S-TIM22
648338ZF11.6476933.843.8416648339SF2648-338FD2648338PBM22
673322H-ZF21.672732.172.9on stock19673323N-SF5673322E-FD5673321S-TIM25
673322ZF21.672732.174.0816673322SF5673322FD5673321PBM25
717295H-ZF31.7173629.53.06on stock29717296N-SF1717295E-FD1717295S-TIH1
717295ZF31.7173629.54.4622717295SF1717295FD1717295PBH1
728283H-ZF4A1.7282528.323.05on stock26728285N-SF10728-283E-FD10728285S-TIH10
728283H-ZF4AGT1.7282528.323.05on stock29
728283ZF41.7282528.324.5120728284SF10728-283FD10728285PBH10
740283H-ZF51.7428.33.16on stock54740283S-TIH3
740282ZF51.7428.244.6525740282SF3740-282FD3740283PBH3
755275H-ZF61.755227.533.24on stock43755274N-SF4755-275E-FD4755275S-TIH4
755275ZF61.755227.534.78on stock17755276SF4755-275FD4755275PBH4
805255H-ZF7LA1.8051825.463.35on stock49805254N-SF6805-255FD60805254S-TIH6
805255H-ZF7LAGT1.8051825.463.35on stock49805254N-SF6HT ultra805-255FD60-w
806254ZF71.8062725.375.19common25
805255ZF7L1.8051825.465.19on stock25805254SF6805-255FD6805254PBH6
805255ZF7LGT1.8051825.465.19low avaibility45
654337ZF81.6544633.653.9160654337SF9654-337FD9654336PBM29
689312H-ZF101.6889331.162.92very common34689313N-SF8689-312E-FD8689311S-TIM28
689312ZF101.6889331.184.2145689313SF8689-312FD8689311PBM28
699301H-ZF111.6989430.052.95very common36699302N-SF15699-301E-FD15699301S-TIM35
699301ZF111.6989530.074.0645699302SF15699-301FD15699301PBM35
762266H-ZF121.7618226.613.17very common71762265N-SF14762-266FD140762265S-TIH14
762266ZF121.7618226.554.6460762265SF14762-266FD14762265PBH14
785257H-ZF131.7847225.723.25on stock49785257N-SF11785-257FD110785257S-TIH11
785257H-ZF13GT1.7847225.723.25on stock49
785258ZF131.7847225.764.8743785258SF11785-257FD110785257PBH11
667331H-ZF391.666833.052.92low avaibility51667330S-TlM39
741278H-ZF501.7407727.763.1common54741-278E-FD13741278S-TIH13
741278ZF501.7407727.764.4664741276SF13741-278FD13741278PBH13
785261ZF511.784726.084.9964785261SF56A785-261FDS3785262PBH23
847238H-ZF521.8466623.783.51on stock50847238N-SF57847-238FDS90847238S-TIH53
847238H-ZF52GT1.8466623.783.51on stock50847238N-SF57HT ultra847-238FDS90-SG847238S-TIH53W
847238H-ZF52TT1.8466623.783.51low avaibility101
847238H-ZF52A1.8466623.783.52low avaibility74847238N-SF57847-238FDS90847238S-TIH53
847238ZF521.8466623.835.49low avaibility57847238SF57847238FDS9847239PBH53
923209H-ZF621.9228620.884.01on stock163923209N-SF66923209E-FDS1
923209H-ZF62GT1.9228620.884.01common212923209N-SF66923-209E-FDS1-w
808227H-ZF711.808122.73.3uncommon258808-228FD225808228S-NPH1
808227H-ZF71GT1.808122.73.3low avaibility284808-228FD225808228S-NPH1W
923189H-ZF72A1.9228618.93.57on stock166923189S-NPH2
923189H-ZF72AGT1.9228618.93.57common200
959175H-ZF731.9590617.473.49low avaibility323959175S-NPH3
959175H-ZF73GT1.9590617.473.49low avaibility375
946179H-ZF881.9459517.943.52on stock166946-180FDS18
946179H-ZF88GT1.9459517.943.52common212946-180FDS 18-W
694492H-LaF11.6936249.193.85low avaibility61-694508(S-LAL58)
717479H-LaF21.71747.894.25very common40717480N-LAF3717-480LAF3717479S-LAM3
744449H-LaF3B1.74444.94.39on stock33744449N-LAF2744-449LAF2744448S-LAM2
750350H-LaF41.749534.993.92very common60750348N-LAF7750-350E-LAF7750353S-LAM7
750350H-LaF4GT1.749534.993.92very common65
754375H-LaFL51.7536737.493.71low avaibility92
757477H-LaF6LA1.75747.714.06low avaibility87757478LAFN24757477NBF2757478S-LAM54
782371H-LaF71.7817937.093.77low avaibility89782372LAF22A
788475H-LaF10LA1.78847.494.3on stock49788475N-LAF21788-475TAF4788474S-LAH64
773496H-LaF50B1.772549.64.24on stock39773496N-LAF34773496TAF1773496S LAH66
700481H-LaF511.748.083.82low avaibility63700481S-LAM51
786442H-LaF521.785944.194.39very common71786441N-LAF33786-439NBFD11786442S-LAH51
743492H-LaF531.743349.224.16very common59743494N-LAF35743-492NBF1743493S-LAM60
800422H-LaF541.7995242.244.51very common78800424N-LAF36800-423NBFD12800422S-LAH52
762401H-LaF551.76240.114.3low avaibility79762401S-LAM55
720437H-LaF621.7243.683.89low avaibility62720437S-LAM52
802443H-ZLaF11.8016644.264.3low avaibility115802443LASF11802-443NBFD14
803468H-ZLaF2A1.8027946.764.65low avaibility165803468LASF1803467LAH62
855366H-ZLaF31.8554436.594.5low avaibility167855366LASF13855-366TAFD13
911353H-ZLaF4LA1.9108235.255.07on stock93911-353TAFD35
911353H-ZLaF4LB1.9108235.284.84low avaibility75911-353TAFD35
804466H-ZLaF50E1.80446.574.44on stock55804465N-LASF44804-465TAF3D804466S-LAH65VS
804466H-ZLaF50D1.80446.584.52low avaibility124804465N-LASF44804-465TAF3804466S-LAH65VS
805396H-ZLaF511.804539.644.41uncommon109805-396NBFD3-804396(S-LAH63)
806410H-ZLaF52A1.806141.024.48low avaibility65806406N-LASF43806-407NBFD13806409S-LAH53V
806410H-ZLaF521.806140.954.45low avaibility86806406N-LASF43806-407NBFD13806409S-LAH53V
834372H-ZLaF53B1.83437.214.54on stock58834373N-LASF40834-373NBFD10834372S-LAH60
834372H-ZLaF53BGT1.83437.214.54on stock93
835427H-ZLaF55D1.8348142.734.56on stock62835431N-LASF41835-427TAFD5G835427S-LAH55VS
835427H-ZLaF55C1.8348142.714.73low avaibility62835431N-LASF41835-427TAFD5F835427S-LAH55VS
806333H-ZLaF56B1.806133.273.79on stock55806-333NBFD15
801350H-ZLaF661.80134.973.89very common59801350N-LASF45801350S-LAM66
801350H-ZLaF66GT1.80134.973.89very common59801350N-LASF45HT
883409H-ZLaF68C1.88340.855.34very common246883408N-LASF31A883-408TAFD30883408S-LAH58
883392H-ZLaF68N1.88339.225.17common152
883408H-ZLaF68B1.88340.795.53low avaibility362883408N-LASF31A883-408TAFD30883408S-LAH58
816465H-ZLaF691.81646.555.01low avaibility231816-466TAF5816466S LAH59
816466H-ZLaF69A1.81646.565.06common194816-466TAF5816466S-LAH59
850323H-ZLaF711.8502632.34.22very common108850323S LAH71
850322H-ZLaF71AGT1.8502632.224.42low avaibility108850322N-LASF9
881402H-ZLaF731.88140.165.2uncommon267881401TAFD33
904313H-ZLaF75A1.9036631.324.56on stock65904313N-LASF46A904-313TAFD25904313S-LAH95
904314H-ZLaF75B1.9036631.424.56low avaibility118904313N-LASF46B904-313TAFD25904313S-LAH95
850301H-ZLaF761.8501330.063.98low avaibility109850300S-NBH57
850300H-ZLaF76A1.8501330.014.31common82850300S-NBH57
901371H-ZLaF78B1.9006937.054.95low avaibility164(900-374)(TAFD37A)
954323H-ZLaF89L1.9537532.315.1common132954-323TAFD45954323S-LAH98
1254H-ZLaF902.0006925.434.74very common90001-255TAFD40
3283H-ZLaF922.003328.325.02uncommon1163283S-LAH79
613441H-TF3L1.613444.112.8on stock100613445N-KZFS4613444E-ADF10613443S-NBM51
612441TF31.6124244.093.25low avaibility180
654395H-TF51.654139.543.01low avaibility132654397N-KZFS5654-396E-ADF50654397S-NBH5
497816D-FK611.49781.613.9low avaibility173497-816M-FCD1
497816D-FK61A1.49781.613.68on stock140497-816M-FCD1
438945D-FK951.437894.523.52low avaibility189
487704D-QK3L1.4874970.442.43very common92487704N-FK5
516641D-K91.5163364.062.41low avaibility41516641P-BK7516641L-BSL7
516641D-K9GT1.5163364.062.41common51
518635D-K591.517663.52.41low avaibility41
525704D-PK31.52570.372.65low avaibility255
621638D-ZPK1A1.6208763.833.69common182(619-639)(M-PCD4)
594673D-ZPK31.5941967.33.37low avaibility190(592-670)(M-PCD51)
593683D-ZPK51.592868.344.29low avaibility150593-686FCD515
569713D-ZPK71.5690771.34.36low avaibility221
583594D-ZK21.5831359.382.96very common47583-595M-BACD12583594L-BAL42
587596D-ZK2L1.58759.62.99low avaibility47
589612D-ZK31.5891361.152.83very common47589612P-SK58A589-613M-BACD5N589612L-BAL35
592607D-ZK3L1.591760.72.84low avaibility49
624582D-ZK211.6244658.212.99low avaibility51(623-582)(M-BACD15)
609579D-ZK791.6088657.93.19low avaibility87610579(P-SK60)
678549D-LaK51.677954.893.37low avaibility91678549L-LAL12
694531D-LaK61.6938453.133.5very common69694532P-LAK35694-532M-LAC130694532L-LAL13
731539D-LaK521.730553.944low avaibility106729-540M-TAC80
669554D-LaK701.669155.393.35low avaibility115
689311D-ZF101.6889331.082.84common77689313P-SF8689-312M-FD80689310L-TIM28
2207D-ZF932.001720.76.11low avaibility252(002-193)(M-FDS2)
774496D-LaF501.77449.594.93on stock156(773-495)(M-TAF1)
768493D-LaF0501.7684249.284.51very common186768-492M-TAF101
743493D-LaF531.743349.334.26common126743-493M-NBF1743-493I-LAM60
731405D-LaF791.7307740.513.21low avaibility171731-405M-LAF81731405L-LAM69
803455D-ZLaF501.8033745.494.89common254(801-455)(M-TAF31)
810410D-ZLaF52LA1.8140.994.56very common104810409P-LASF51
822427D-ZLaF611.8224142.714.92low avaibility249(821-427)(M-TAFD51)
884372D-ZLaF671.8838537.25.5common325(882-372)(M-TAFD307)
809410D-ZLaF811.8088414.55low avaibility123809405P-LASF50(808-409)(MC-NBFD135)
852401D-ZLaF85A1.8522240.115.22very common307(851-401)(M-TAFD305)~854404(L-LAH85V)
854406D-ZLaF85L1.853740.585.28low avaibility371(851-401)(M-TAFD305)854404L-LAH85V
855406D-ZLaF85LS1.854540.595.29low avaibility371(851-401)(M-TAFD305)854404L-LAH85V
846401D-ZLaF85LN1.8455840.094.96common134(851-401)(M-TAFD305)854404L-LAH85V
487704H-QK3LGTi487705FK5HTi487703S-FSL5Y
519633H-K90GTi517642(N-BK7HTi)~516643(BSL7Y)
581409QF50GTi581409LF5HTi581408PBL25Y
620364F4GTi620364F2HT620363PBM2Y

What is the meaning of the glass type letters ?

Letters in the glass types correspond to specific information about the glass. For example prefix “H” (H-K9L) for CDGM is meant for environment friendly glass (no lead, no cadmium, no arsenic) and is equivalent to “N” prefix for Schott.

Prefix D for CDGM is used to show that a glass is easily moldable as having a low softening point.

How to read glass code and glass index

Glass codes are set according to international usage, it is made of 6 digits and can be divided in two 3 digits numbers : the three first digits being the rounded value after the decimal point of glass refractive index (nd) and the three last digits being the abbe number (Vd) rounded at the decimal value.

For example H-BaK2 code is 540597 coming from nd : 1.53996 (rounded to 540) and Vd : 59.72.

What is nd & Vd ?

The nd value stands for refractive index of a glass at 587.56 nm wavelength. While Vd is the value of glass’s Abbe number also at 587.56nm. Optical glass material suppliers provide different tolerance level for nd & Vd, the tightest being grade 1 (+/-30×10-5 for nd & +/-0.5% on Vd).

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