Plano concave lens bend parallel input rays so they diverge from one another on the output side of the lens and hence have a negative focal length. The spherical aberration of the plano concave lenses is negative and can be used to balance aberrations created by other lenses. Similar to the plano concave lens, the curvature surface usually faces the largest object distance or the infinite conjugate to minimize spherical aberration.
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Ecoptik Plano concave lens bend parallel input rays so they diverge from one another on the output side of the lens and hence have a negative focal length. The spherical aberration of the plano concave lenses is negative
| Material | Optical glass/ Fused silica/ sapphire etc. |
| Diameter | 2mm~300mm |
| Diameter tolerance | ±0.05mm(≤50mm) |
| ±0.1mm(＞50mm) | |
| Focal length | -50mm~-2000mm |
| Focal length tolerance | ±0.2%（＜10mm） |
| ±0.5%（＜10mm-1000mm） | |
| ±1%（＜＞1000mm） | |
| Edge Thickness | 2mm~20mm |
| Surface quality | 60/40， 40/20， 20/10 |
| Surface accuracy | λ/2~λ/10@632.8nm，532nm, etc. |
| Clear Aperture | >85% dig diameter |
| Centration | <3arc min~ 30arc sec |
| Chamfer | <0.2mm×45° |
| Coating | As per customer’s request |
| Type No. | Diameter (mm) | Center Thickness (mm) | Edge Thickness (mm) | Effective Focal Length (mm) |
| PCA-6 | 6 | 2 | 2.9 | -10 |
| PCA-7.8 | 7.8 | 5.3 | 16.3 | -12.7 |
| PCA-8 | 8 | 2 | 3 | -15 |
| PCA-10 | 10 | 2 | 3.2 | -20 |
| PCA-12.7-A | 12.7 | 2 | 4.1 | -20 |
| PCA-12.7-B | 12.7 | 2 | 3.4 | -30 |
| PCA-12.7-C | 12.7 | 2 | 2.8 | -50 |
| PCA-12.7-D | 12.7 | 2 | 2.3 | -100 |
| PCA-15 | 15 | 2 | 2.7 | -75 |
| PCA-21 | 21 | 2 | 4.7 | -40- |
| PCA-22.4 | 22.4 | 2 | 3.2 | -100 |
| PCA-25.4-B | 25.4 | 2 | 7.2 | -35 |
| PCA-25.4-C | 25.4 | 2 | 4.3 | -70 |
| PCA-25.4-D | 25.4 | 2 | 4.1 | -75 |
| PCA-25.4-E | 25.4 | 2 | 3.6 | -100 |
| PCA-25.4-F | 25.4 | 2 | 3 | -150 |
| PCA-25.4-G | 25.4 | 2 | 2.7 | -200 |
| PCA-25.4-H | 25.4 | 2 | 2.5 | -300 |
| PCA-25.4-I | 25.4 | 2 | 2.3 | -500 |
| PCA-25.4-J | 25.4 | 2 | 2.2 | -1000 |
| PCA-30 | 30 | 2 | 4.8 | -80 |
| PCA-38-A | 38 | 3 | 11.3 | -50 |
| PCA-38-B | 38 | 3 | 6.6 | -100 |
| PCA-38-C | 38 | 3 | 4.8 | -200 |
| PCA-38-D | 38 | 3 | 4 | -350 |
| PCA-38-E | 38 | 3 | 3.7 | -500 |
| PCA-38-F | 38 | 3 | 3.5 | -700 |
| PCA-50-A | 50 | 5 | 11 | -100 |
| PCA-50-B | 50 | 5 | 9.7 | -125 |
| PCA-50-C | 50 | 3 | 4.2 | -500 |
| PCA-50-D | 50 | 3 | 3.8 | -800 |
| PCA-50.8-A | 50.8 | 3.5 | 13 | -75 |
| PCA-50.8-B | 50.8 | 4 | 10.7 | -100 |
| PCA-50.8-C | 50.8 | 4 | 8.3 | -150 |
| PCA-75-A | 75 | 5 | 14.6 | -150 |
| PCA-75-B | 75 | 5 | 12 | -200 |
| PCA-100-A | 100 | 6 | 18.85 | -200 |
| PCA-100-B | 100 | 6 | 16 | -250 |
| PCA-100-C | 100 | 6.2 | 14.45 | -300 |
| PCA-100-D | 100 | 8.2 | 14.32 | -400 |
| PCA-100-E | 100 | 8 | 12.87 | -500 |
| PCA-100-F | 100 | 9.6 | 13.64 | -600 |
| PCA-125-A | 125 | 4.2 | 17.3 | -300 |
| PCA-125-B | 125 | 5.6 | 15.24 | -400 |
| PCA-125-C | 125 | 6 | 13.64 | -500 |
| PCA-125-D | 125 | 9 | 15.34 | -600 |
| PCA-125-E | 125 | 8.4 | 13.82 | -700 |
| PCA-125-F | 125 | 9.6 | 14.34 | -800 |
| PCA-150-A | 150 | 5 | 19.03 | -400 |
| PCA-150-B | 150 | 6.2 | 17.29 | -500 |
| PCA-150-C | 150 | 7.5 | 16.68 | -600 |
| PCA-150-D | 150 | 9 | 16.83 | -700 |
| PCA-150-E | 150 | 8 | 14.84 | -800 |
| PCA-200-A | 200 | 6.57 | 26.63 | -500 |
| PCA-200-B | 200 | 7.8 | 24.31 | -600 |
| PCA-200-C | 200 | 9.2 | 23.25 | -700 |
| PCA-200-D | 200 | 10.5 | 22.73 | -800 |
| PCA-200-E | 200 | 11.8 | 22.64 | -900 |
| PCA-200-F | 200 | 13.1 | 22.83 | -1000 |
| PCA-250-A | 250 | 6 | 28.2 | -700 |
| PCA-250-B | 250 | 6.9 | 26.18 | -800 |
| PCA-250-C | 250 | 8 | 25.05 | -900 |
| PCA-250-D | 250 | 9.5 | 28.45 | -1000 |
| PCA-250-E | 250 | 12 | 25.87 | -1100 |
| PCA-250-F | 250 | 15 | 27.69 | -1200 |
| PCA-300-A | 300 | 10 | 32.17 | -1000 |
| PCA-300-B | 300 | 12 | 30.35 | -1200 |
| PCA-300-C | 300 | 14 | 29.67 | -1400 |
| PCA-300-D | 300 | 16 | 29.67 | -1600 |
| Material | Diameter (mm) | Concave Surface Radius (mm) | Center Thickness (mm) | Focal Length (mm) |
| H-K9L | 3 | -3.05 | 3 | -5.9 |
| H-K9L | 5 | -51.68 | 5 | -100 |
| H-K9L | 9 | -10.8 | 1.4 | -20.9 |
| JGS1 | 10 | -13.81 | 2 | -30.1 |
| Corning 7978 | 10 | -6.111 | 2 | -13.3 |
| H-K9L | 11 | -11.695 | 1 | -22.65 |
| H-K9L | 12 | -42.63 | 1.5 | -82.5 |
| Coring7978 | 12 | -27 | 2 | -58.9 |
| Corning 7978 | 12 | -18.155 | 2 | -39.6 |
| H-K9L | 12 | -13.4 | 1.4 | -26 |
| HWB850 | 12 | -8.3 | 3 | -16 |
| H-ZF7LA | 12 | -9 | 2 | -11.2 |
| JGS1 | 12.7 | -600 | 3 | -300 |
| JGS1 | 12.7 | -500 | 3 | -250 |
| JGS1 | 12.7 | -33.624 | 3.4 | -16.8 |
| H-ZK6 | 13 | -7.238 | 3 | -12.4 |
| H-LAF3 | 14 | -8.6 | 2 | -11.6 |
| H-K9L | 15 | -36.07 | 4.2 | -69.8 |
| HWB850 | 17 | -18.42 | 1.5 | -34.4 |
| H-K9L | 19 | -8.5 | 2 | -16.5 |
| ZF6 | 19 | -9.615 | 2 | -12.7 |
| H-K9L | 20 | -1500 | 3 | -2902 |
| H-K9L | 20 | -1000 | 3 | -1935 |
| H-K9L | 20 | -800 | 3 | -1548 |
| H-K9L | 20 | -500 | 3 | -967 |
| JGS1 | 20 | -33.332 | 4 | -72.7 |
| JGS1 | 20 | -31.688 | 3 | -69.1 |
| H-ZF7LA | 20 | -23.55 | 1.4 | -28.9 |
| B270 | 21.9 | -14.12 | 4.1 | -27 |
| H-K9L | 22 | -27 | 2 | -52.2 |
| Silica | 22.5 | -90 | 4.3 | -45 |
| ZF2 | 24 | -19.8 | 4.1 | -29.43 |
| H-K9L | 25 | -51.68 | 3.5 | -100 |
| JGS1 | 25 | -45.84 | 2.5 | -100 |
| JGS1 | 25 | -22.92 | 2 | -50 |
| JGS1 | 25 | -22.89 | 3 | -50 |
| JGS1 | 25.4 | -150 | 3 | -75 |
| JGS1 | 25.4 | -23 | 2 | -50 |
| Silica | 25.4 | -38.1 | 3.18 | -19 |
| H-ZF3 | 28 | -13.964 | 14 | -19.5 |
| H-ZF7LA | 30 | -12.706 | 1.2 | -15.6 |
| ZK2 | 30.3 | -82.6 | 2 | -141.56 |
| H-ZF7LA | 32 | -18.7 | 8.05 | -23.2 |
| H-K9L | 33 | -155 | 2.5 | -299.92 |
| H-K9L | 42 | -51.87 | 2 | -100 |
| JGS1 | 42 | -34.78 | 3 | -75.9 |
| H-ZF7LA | 44.98 | -35.149 | 2.5 | -43.7 |
| JGS1 | 46 | -70.96 | 3 | -155 |
| H-ZF7LA | 51.98 | -35.149 | 2 | -43.7 |
| H-ZF7LA | 52 | -44.3 | 3.485 | -55 |
| H-K9L | 58 | -600 | 10 | -1161 |
| ZBaF5 | 58 | -39.17 | 2 | -58.37 |
| H-ZF11 | 99 | -116.83 | 3.5 | -167 |
| H-K9L | 100 | -2000 | 12 | -1000 |
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