平凹透鏡是一面是球面，一面為平面的，中間也薄于兩邊。它們具有負的焦距，被用于發(fā)散一束平行光。
可用于校正其他透鏡的相差、球差、慧差、畸變。
常規(guī)產品規(guī)格如下表，我們也可以為客戶定做各種規(guī)格的分光鏡。
常規(guī)產品規(guī)格
| 平凹透鏡（尺寸及鍍膜可按用戶需求定制）單位mm | |||||
| 序號 | 品號 | 焦距 | 外徑 | 中心厚度 | 材料 |
| 1 | PO-001 | -1941.00 | 20.0 | 2.0 (±0.05) | H-K9L |
| 2 | PO-002 | -188.50 | 28.4 | 3.0 (±0.2) | ZF2 |
| 3 | PO-003 | -116.49 | 37.0 | 4.0 (±0.1) | ZF2 |
| 4 | PO-004 | -113.39 | 43.5 | 3.7 (±0.1) | H-F4 |
| 5 | PO-005 | -82.24 | 24.0 | 2.0 (±0.1) | K9 |
| 6 | PO-006 | -61.45 | 6.0 | 1.2 (±0.1) | ZF2 |
| 7 | PO-007 | -56.96 | 21.0 | 2.0 (±0.05) | H-F4 |
| 8 | PO-008 | -47.93 | 16.0 | 2.0 (±0.1) | ZK11 |
| 9 | PO-009 | -27.15 | 26.0 | 1.6 (±0.1) | 青玻璃 |
| 10 | PO-010 | -23.03 | 14.0 | 1.6 (±0.1) | ZF2 |
| 11 | PO-011 | -20.76 | 15.0 | 2.5 (±0.1) | ZK3 |
| 12 | PO-012 | -11.20 | 9.0 | 1.0 (±0.05) | H-ZF7L |
| 13 | PO-013 | -10.62 | 9.0 | 1.0 (±0.05) | H-ZF7L |
| 14 | PO-014 | -10.10 | 9.0 | 1.0 (±0.05) | ZF13 |
| 15 | PO-015 | -8.16 | 9.0 | 1.0 (±0.05) | ZF7 |
| 16 | PO-016 | -7.99 | 9.0 | 1.0 (±0.05) | ZF7 |
| 17 | PO-017 | -7.85 | 9.5 | 1.2 (±0.05) | ZF6 |
| 18 | PO-018 | -7.56 | 9.0 | 1.0 (±0.05) | ZF6 |
| 19 | PO-019 | -6.00 | 6.3 | 1.0 (±0.1) | K9A |
| 20 | PO-020 | 70.12 | 6.0 | 1.2 (±0.1) | ZF2 |
| 21 | PO-021 | 108.81 | 40.0 | 3.0 (±0.05) | ZF1 |
| 22 | PO-022 | 2000.00 | 10.0 | 2.0 (±0.05) | H-K9L |
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