1）在750 - 1550nm波段每個鍍膜面的反射率<0.7%> 2）兩個外表面分別向內凹，焦距為負 3）用于成像系統的光束發散 雙凹鏡片（DCV）兩表面向內凹，焦距為負，可用于成像方面以及發散光束。 本品可選 未鍍膜版 或鍍以下減反膜: MgF2, VIS 0°, VIS-NIR 和 NIR I.
技術數據 
標題 | 產品號 |
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6mm Dia. x -6mm FL, NIR II Coated, Double-Concave Lens | #68-005 | 6mm Dia. x -6mm FL, NIR II, Inked, Double-Concave Lens | #68-005-INK | 6mm Dia. x -9mm FL, NIR II Coated, Double-Concave Lens | #68-006 | 6mm Dia. x -9mm FL, NIR II, Inked, Double-Concave Lens | #68-006-INK | 6mm Dia. x -12mm FL, NIR II Coated, Double-Concave Lens | #68-007 | 6mm Dia. x -12mm FL, NIR II, Inked, Double-Concave Lens | #68-007-INK | 9mm Dia. x -9mm FL, NIR II Coated, Double-Concave Lens | #68-008 | 9mm Dia. x -9mm FL, NIR II, Inked, Double-Concave Lens | #68-008-INK | 9mm Dia. x -12mm FL, NIR II Coated, Double-Concave Lens | #68-009 | 9mm Dia. x -12mm FL, NIR II, Inked, Double-Concave Lens | #68-009-INK | 9mm Dia. x -18mm FL, NIR II Coated, Double-Concave Lens | #68-010 | 9mm Dia. x -18mm FL, NIR II, Inked, Double-Concave Lens | #68-010-INK | 12mm Dia. x -12mm FL, NIR II Coated, Double-Concave Lens | #68-011 | 12mm Dia. x -12mm FL, NIR II, Inked, Double-Concave Lens | #68-011-INK | 12mm Dia. x -18mm FL, NIR II Coated, Double-Concave Lens | #68-012 | 12mm Dia. x -18mm FL, NIR II, Inked, Double-Concave Lens | #68-012-INK | 12mm Dia. x -24mm FL, NIR II Coated, Double-Concave Lens | #68-013 | 12mm Dia. x -24mm FL, NIR II, Inked, Double-Concave Lens | #68-013-INK | 20mm Dia. x -20mm FL, NIR II Coated, Double-Concave Lens | #68-014 | 20mm Dia. x -20mm FL, NIR II, Inked, Double-Concave Lens | #68-014-INK | 25mm Dia. x -25mm FL, NIR II Coated, Double-Concave Lens | #68-015 | 25mm Dia. x -25mm FL, NIR II, Inked, Double-Concave Lens | #68-015-INK | 25mm Dia. x -50mm FL, NIR II Coated, Double-Concave Lens | #68-016 | 25mm Dia. x -50mm FL, NIR II, Inked, Double-Concave Lens | #68-016-INK | 25mm Dia. x -100mm FL, NIR II Coated, Double-Concave Lens | #68-017 | 25mm Dia. x -100mm FL, NIR II, Inked, Double-Concave Lens | #68-017-INK |
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