Material   Zinc Sulphide    Surface figure   Lambda/2 at 633 nm per inch   Scratch-Dig   80 - 50   Diameter   tolerance   ± 0.1 mm   Paraxial   Focal Length   Tolerance   ± 2%   Centration   less than 5 arc minutes   Clear aperture   > 80%   Bevels   (0.2+0.3)mm x 45°

D, mm FLx, mm R, mm tc, mm temin, mm Part Number 12.7 12.7 15.24 3.4 2.0 PCX18-01 12.7 19.0 22.86 2.9 2.0 PCX18-02 12.7 25.0 30.00 2.7 2.0 PCX18-03 19.05 19.0 22.86 4.1 2.0 PCX18-04 19.05 25.0 30.00 3.6 2.0 PCX18-05 19.05 50.0 60.00 2.8 2.0 PCX18-06 19.05 75.0 90.00 2.5 2.0 PCX18-07 25.4 25.0 30.00 4.8 2.0 PCX18-08 25.4 50.0 60.00 3.4 2.0 PCX18-09 25.4 75.0 90.00 2.9 2.0 PCX18-10 25.4 100.0 120.00 2.7 2.0 PCX18-11             * Numerical parameters correspond to Lambda=10.6µm (n=2.2)

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