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By certification 
Material:BK7
Size:10mm-200mm
Fringes:λ/2,λ/4
Center Thickness Tolerance:15mm~25mm
Dispersion Round :0.03mm—0.2mm
Centration:3 arc min
Surface Quality:60—40scratch and dig,80—50scratch and
dig
Clear aperture:90％
Coating:avaliable upon request
Size:10mm-200mm
Fringes:λ/2,λ/4
Center Thickness Tolerance:15mm~25mm
Dispersion Round :0.03mm—0.2mm
Centration:3 arc min
Surface Quality:60—40scratch and dig,80—50scratch and
dig
Clear aperture:90％
Coating:avaliable upon request
