20mm Dia. x -20mm FL, Uncoated, Double-Concave Lens

Diameter (mm):

20.00 +0.0/-0.025

Effective Focal Length EFL (mm):

-20.00

Back Focal Length BFL (mm):

-20.55

Coating:

Uncoated

N-SF11

Surface Quality:

40-20

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Clear Aperture CA (mm):

19.00

Center Thickness CT (mm):

2.00

Center Thickness Tolerance (mm):

±0.10

Centering (arcmin):

Bevel:

Protective bevel as needed

Edge Thickness ET (mm):

5.03

f/#:

1.00

Focal Length Specification Wavelength (nm):

587.6

Focal Length Tolerance (%):

±1

Numerical Aperture NA:

0.50

Radius R₁=-R₂ (mm):

-31.82

Type:

Double-Concave Lens

Wavelength Range (nm):

400 - 2500

Regulatory Compliance

RoHS 2015:

Compliant

Reach 219:

Compliant

產品系列說明

波長範圍是350-2200nm
憑藉精密的直徑及同軸性容差可輕鬆實現OEM整合
提供各種直徑及焦距
提供附加抗反射鍍膜選擇：MgF₂、VIS 0°、VIS-NIR、NIR I及NIR II

雙凹 (DCV) 透鏡具有兩個向內彎曲的曲面以及負焦距。它們用於影像縮小及散射光線

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