40mm Dia. x 250mm FL, MgF2 Coated, Achromatic Doublet Lens

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40mm Dia. x 250mm FL, MgF₂ Coated, Achromatic Doublet Lens

Diameter (mm):

40.00 +0.0/-0.025

Effective Focal Length EFL (mm):

250.00

Focal Length Tolerance (%):

±2

Back Focal Length BFL (mm):

244.32

Focal Length Specification Wavelength (nm):

587.6

Clear Aperture CA (mm):

39.00

Centering (arcmin):

Center Thickness CT 1 (mm):

8.00

Center Thickness CT 2 (mm):

4.50

Center Thickness Tolerance (mm):

±0.2

Radius R₁ (mm):

156.00

Radius R₂ (mm):

-108.70

Radius R₃ (mm):

-313.64

Edge Thickness ET (mm):

10.57

Substrate:

N-BK7 / N-SF5

Surface Quality:

40-20

f/#:

6.25

Numerical Aperture NA:

0.08

Coating:

MgF₂ (400-700nm)

Coating Specification:

R_avg ≤1.75% @ 400 - 700nm

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):

400 - 700

Regulatory Compliance

RoHS 2015:

Compliant

REACH 201:

Compliant

產品系列說明

Designed for 0° Angle of Incidence
Less Than 1.75% Reflectance Per Surface @ 400 - 700nm
VIS 0° and VIS-NIR Coated Achromats Also Available

Achromatic doublet 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. Our achromatic doublets are available with a single layer MgF₂ coating or a broadband multi-layer coating for the visible spectrum. NIR achromatic doublets and edge blackened achromatic doublets are also available.

Achromatic doublet lenses are far superior to simple lenses for multi-color ("white light") imaging. The two elements composing an achromatic doublet lens (literally, "a lens with no color") are paired together for their ability to correct the color separation inherent in glass. Having eliminated the problematic chromatic aberrations, achromatic doublet lenses become the most cost-efficient means for good polychromatic illumination and imaging.