Diameter (mm):

9.00

Effective Focal Length EFL (mm):

-18.00

N-BK7

f/#:

2.00

Numerical Aperture NA:

0.25

Coating:

VIS-NIR (400-1000nm)

Type:

Double-Concave Lens

Wavelength Range (nm):

400 - 1000

Back Focal Length BFL (mm):

-18.49

Bevel:

Protective bevel as needed

Center Thickness CT (mm):

1.50

Center Thickness Tolerance (mm):

±0.05

Centering (arcmin):

<1

Clear Aperture CA (mm):

8.1

Coating Specification:

R_abs ≤0.25% @ 880nm
R_avg ≤1.25% @ 400 - 870nm
R_avg ≤1.25% @ 890 - 1000nm

Edge Thickness ET (mm):

2.45

Focal Length Tolerance (%):

±1

Radius R₁=-R₂ (mm):

-18.86

Surface Quality:

40-20

RoHS:

Compliant

Certificate of Conformance:

View

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

9mm Dia. x -18mm FL, VIS-NIR, Inked, Double-Concave Lens

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