BK製兩凹透鏡。
具有負焦點距離，可擴展光線。
相比平凹透鏡，焦點距離可更短。
不帶反射防止膜。
| 款型 | φD [mm] |
φf [mm] |
φfb [mm] |
| S54-10-10 | 10 | -10 | -10.33 |
| S54-10-20 | 10 | -20 | -20.38 |
| S54-10-30 | 10 | -30 | -30.35 |
| S54-10-40 | 10 | -40 | -40.34 |
| S54-10-60 | 10 | -60 | -60.65 |
| S54-10-80 | 10 | -80 | -80.66 |
| S54-10-100 | 10 | -100 | -100.65 |
| S54-20-20 | 20 | -20 | -20.33 |
| S54-20-30 | 20 | -30 | -30.32 |
| 款型 | φD [mm] |
φf [mm] |
φfb [mm] |
CAD |
| S54-10-10 | 10 | -10 | -10.33 | - |
| S54-10-20 | 10 | -20 | -20.38 | - |
| S54-10-30 | 10 | -30 | -30.35 | - |
| S54-10-40 | 10 | -40 | -40.34 | - |
| S54-10-60 | 10 | -60 | -60.65 | - |
| S54-10-80 | 10 | -80 | -80.66 | - |
| S54-10-100 | 10 | -100 | -100.65 | - |
| S54-20-20 | 20 | -20 | -20.33 | - |
| S54-20-30 | 20 | -30 | -30.32 | - |
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