Dia19.5mm 500-900nm AR Coated Optical Doublet Achromatic Lens Specification: Material: Schott N-LAF34 & Schott N-SF2Diameter: 19.50+0.00/-0.02mmCenter thickness: 10.75+/-0.15mmROC1: 23.032mm+/-0.1%,CXROC2=ROC3: 17.378mm+/-0.1%,DoubletROC4: 15.2mm+/-0.1%,CXFlatness: S1&S2&S3&S4:IR......

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