BK製平凸透鏡。
透過區面測，用於從無限遠收集光線。
不帶反射防止膜。
以提供高紫外域透過率的合成石英透鏡（S61）。
| 款型 | φD [mm] |
φf [mm] |
φfb [mm] |
| S51-10-30 | 10 | 30 | 28.4 |
| S51-10-40 | 10 | 40 | 38.4 |
| S51-10-50 | 10 | 50 | 48.8 |
| S51-10-60 | 10 | 60 | 58.7 |
| S51-10-70 | 10 | 70 | 68.9 |
| S51-10-80 | 10 | 80 | 78.8 |
| S51-10-100 | 10 | 100 | 98.8 |
| S51-20-30 | 20 | 30 | 26.3 |
| S51-20-40 | 20 | 40 | 37 |
| S51-20-50 | 20 | 50 | 47.4 |
| S51-20-60 | 20 | 60 | 57.5 |
| S51-20-80 | 20 | 80 | 77.8 |
| S51-20-100 | 20 | 100 | 98.1 |
| S51-20-150 | 20 | 150 | 148.1 |
| S51-20-200 | 20 | 200 | 198.4 |
| S51-20-300 | 20 | 300 | 298.4 |
| S51-30-40 | 30 | 40 | 34.5 |
| S51-30-50 | 30 | 50 | 45.7 |
| S51-30-60 | 30 | 60 | 56 |
| S51-30-70 | 30 | 70 | 66.4 |
| S51-30-80 | 30 | 80 | 76.7 |
| S51-30-90 | 30 | 90 | 87.1 |
| S51-30-100 | 30 | 100 | 96.7 |
| S51-30-150 | 30 | 150 | 147.8 |
| S51-30-200 | 30 | 200 | 198.1 |
| S51-30-300 | 30 | 300 | 297.6 |
| S51-50-60 | 50 | 60 | 49.6 |
| S51-50-70 | 50 | 70 | 61.3 |
| S51-50-80 | 50 | 80 | 72.3 |
| S51-50-90 | 50 | 90 | 83 |
| S51-50-100 | 50 | 100 | 93.5 |
| S51-50-150 | 50 | 150 | 145.2 |
| S51-50-200 | 50 | 200 | 195.7 |
| S51-50-300 | 50 | 300 |
296.4 |
| 款型 | φD [mm] |
φf [mm] |
φfb [mm] |
CAD |
| S51-10-30 | 10 | 30 | 28.4 | - |
| S51-10-40 | 10 | 40 | 38.4 | - |
| S51-10-50 | 10 | 50 | 48.8 | - |
| S51-10-60 | 10 | 60 | 58.7 | - |
| S51-10-70 | 10 | 70 | 68.9 | - |
| S51-10-80 | 10 | 80 | 78.8 | - |
| S51-10-100 | 10 | 100 | 98.8 | - |
| S51-20-30 | 20 | 30 | 26.3 | - |
| S51-20-40 | 20 | 40 | 37 | - |
| S51-20-50 | 20 | 50 | 47.4 | - |
| S51-20-60 | 20 | 60 | 57.5 | - |
| S51-20-80 | 20 | 80 | 77.8 | - |
| S51-20-100 | 20 | 100 | 98.1 | - |
| S51-20-150 | 20 | 150 | 148.1 | - |
| S51-20-200 | 20 | 200 | 198.4 | - |
| S51-20-300 | 20 | 300 | 298.4 | - |
| S51-30-40 | 30 | 40 | 34.5 | - |
| S51-30-50 | 30 | 50 | 45.7 | - |
| S51-30-60 | 30 | 60 | 56 | - |
| S51-30-70 | 30 | 70 | 66.4 | - |
| S51-30-80 | 30 | 80 | 76.7 | - |
| S51-30-90 | 30 | 90 | 87.1 | - |
| S51-30-100 | 30 | 100 | 96.7 | - |
| S51-30-150 | 30 | 150 | 147.8 | - |
| S51-30-200 | 30 | 200 | 198.1 | - |
| S51-30-300 | 30 | 300 | 297.6 | - |
| S51-50-60 | 50 | 60 | 49.6 | - |
| S51-50-70 | 50 | 70 | 61.3 | - |
| S51-50-80 | 50 | 80 | 72.3 | - |
| S51-50-90 | 50 | 90 | 83 | - |
| S51-50-100 | 50 | 100 | 93.5 | - |
| S51-50-150 | 50 | 150 | 145.2 | - |
| S51-50-200 | 50 | 200 | 195.7 | - |
| S51-50-300 | 50 | 300 | 296.4 | - |
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