20mm Dia. x 40mm FL, VIS 0° Coated, Achromatic Lens

Diameter (mm):

20.00 +0.0/-0.025

Effective Focal Length EFL (mm):

40.00

Focal Length Tolerance (%):

±2

Back Focal Length BFL (mm):

34.40

Focal Length Specification Wavelength (nm):

587.6

Clear Aperture CA (mm):

19.00

Centering (arcmin):

Center Thickness CT 1 (mm):

8.00

Center Thickness CT 2 (mm):

2.00

Center Thickness Tolerance (mm):

±0.2

Radius R₁ (mm):

27.63

Radius R₂ (mm):

-17.58

Radius R₃ (mm):

-171.25

Edge Thickness ET (mm):

7.83

N-BAF10 / N-SF10

Surface Quality:

40-20

f/#:

2.00

Numerical Aperture NA:

0.25

Coating:

VIS 0° (425-675nm)

Coating Specification:

R_avg ≤0.4% @ 425 - 675nm

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Bevel:

Protective bevel as needed

Type:

Achromatic Lens

Wavelength Range (nm):

425 - 675

Regulatory Compliance

RoHS 2015:

Compliant

Reach 219:

Compliant

Product Family Description

Designed for 0° Angle of Incidence
Less Than 0.4% Reflectance Per Surface from 425 - 675nm
MgF₂ and VIS-NIR Coated Achromats Also Available

Achromatic lenses consist of two optical components cemented together to form an achromatic doublet which is computer optimized to correct for on-axis spherical and chromatic aberrations.

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