Biconcave Lens Double Concave Lens

The biconcave lens, also named double concave lens, is usually made of flint glass and used for beam divergence. It’s focal length is negative but the parallel incident ray diverges outward. The two sides of the biconcave lens curvature radius can be equal or not. Combined with plano-convex lens, it is generally used in beam expanders, projection optical systems and optical viewers, etc.   Oplens can not only customize the common plano-concave lens of N-BK7 or fused quartz, but also customize the biconcave lens of any glass material.   You are welcome to contact us for customized biconcave lenses.   Parameters Material  Optical Glass Surface Flatness  < λ/5 @ 633nm Scratch/Dig  < 40/20 (both sides) Eccentricity  ≤ 1arcmin Focal Length Tolerance  < ± 1% Diameter Tolerance  < + 0.00/ - 0.02mm Thickness Tolerance  < ± 0.05 Clear Aperture  ≥ 95% of diameter Coating  AR OR BBAR Diameter Range  5~260mm   Stock Products:  Serial No. Parts No. Material DIA R1 R2 TC F 1 S41N210.6 ZF1 41 -691.8 -170.22 2.8 -210.60 2 S54N197.1 ZF4 54 -340.4 -248.9 2.5 -197.10 3 S65N190 ZF1 65 -516.37 -162.55 5.49 -190.28 4 S90N152.3 H-K9L 90 -102.45 -346.7 6 -152.30 5 S29.5N143.3 BaK2 29.5 -2249 -80.17 2 -143.32 6 S30.5N136.7 Bak2 30.5 -2249 -76.38 2 -136.76 7 S20N128.3 H-K9L 20 -298.98 -85.4 2 -128.31 8 S25N100BCCFS JGS1 25 -92.08 -92.08 2.5 -100.00 9 S12.5N99 H-K9L 12.5 -102.5 -102.5 1.5 -98.92 10 S68N92.3 H-ZF2 68 -83.49 -249 5.5 -92.30 11 S72N80 H-F4 72 -169.92 -71.8 12 -80.00 12 S72N80NEW H-F4 72 -169.92 -71.8 12 -80.00 13 S58N77.8 H-ZF3 58 -73.79 -234 4 -77.80 14 S30N77 JGS1 30 -70.96 -70.96 3 -77.00 15 S65N67.5 ZBaF3 65 -295.61 -52.36 2.5 -67.53 16 S68N65.6 F13 68 -2465.0 -41.761 3 -65.60 17 S27N62.7 ZK9 27 -148.8 -52.864 1.45 -62.70 18 S60N61.3 F4 60 -74.901 -78.424   -61.33 19 S21N51 H-ZF6 21 -77.39 -77.39 1 -51.00 20 S25N50BCC H-K9L 25 -52.1 -52.1 2.5 -50.00 21 S44N45.8 ZF7L 44 -152.79 -49.036 3.5 -45.80 22 S14N45 H-ZF2 14 -36.17 -192.31 3 -45.00 23 S15N45 H-ZF2 15 -36.17 -192.31 3 -45.00 24 S21N42.8 H-ZF7LA 21 -42.6 -184.33 2 -42.80 25 S28.6N35 H-ZK21 28.6 -280.79 -23.799 4.064 -35.00 26 S13N33.5 H-ZF6 13 -30.567 -153.79 3 -33.50 27 S14N31.6 H-ZF6 14 -34.69 -79.62 3 -31.60 28 S13.5N31.6 H-ZF6 13.5 -34.69 -79.62 3 -31.60 29 S14N27 H-LAK53A 14 -31.693 -58.811 1.5 -27.00 30 S25N25.4 H-LAF4 25 -38.416 -38.416 1.5 -25.40 31 S25N25 H-F4 25 -36.73 -29.17 8.4 -25.00 32 S13N24.4 H-LAK7 13 -48.91 -27.72 3 -24.40 33 S12N24BCC H-K9L 12 -25.14 -25.14 2 -24.00 34 S17.3N23.9 H-LAF50B 17.3 -37.24 -37.24 1.26 -23.90 35 S12N23.4 BAF3 12 -19.543 -47.1 3 -23.44 36 S14N19 H-K9L 14 -27.94 -32.15 2 -19.00 37 S24N18.9 H-K9L 24 -11.092 -89.95 2 -18.90 38 S22N18.7 H-ZF7LA 22 -255.3 -16.218 1 -18.70 39 S20N16.7 H-ZF52A 20 -51.591 -21.003 9 -16.70 40 S15N16.4SZ H-ZF6 15 -22.96 -27.72 1.9 -16.40 41 S15N16.4 H-ZF6 15 -27.542 -23.605 2.8 -16.40 42 S32N15.7 H-ZF3 32 -11.83 -284 7.23 -15.70 43 S15N14.8 H-F3 15 -50.54 -11.31 2 -14.80 44 S16N14.6 H-ZF3 16 -30.62 -15.776 1.5 -14.60 45 S13N11.3 H-ZK2 13 -12.12 -15.69 3 -11.30 46 S16.7N11 H-LAF50B 16.7 -16.82 -17.76 1 -11.00 47 S10N10.4 H-K9L 10 -11.092 -11.092 1.8 -10.40 48 S10N9.8 JGS1 10 -9.247 -9.247 2 -9.80 49 S5N9.8 H-ZF3 5 -14.377 -14.377 1.25 -9.80 50 S8N7.4 H-ZF6 8 -7.2 -30.54 3 -7.40 51 S12N7.4 ZF11 12 -12.622 -12.622 5 -7.40 52 S15N7.4 N-SF6 15 -13.24 -12.05 3 -7.40 53 S11N7.1 H-ZF7LA 11 -11.883 -11.883 2 -7.10 54 S8N7.1 ZF7 8 -11.883 -11.883 2 -7.10 55 S8N7.1NEW H-ZF7LA 8 -11.883 -11.883 2 -7.10 56 S12N5.4 H-ZF6 12 -5.861 -18.267 5 -5.40    If you are finding spherical lenses and aspherical lenses in china, we will be your best choose! We have our own factory, so we can give you a cheap price!