Name: 18mm Dia. x 18mm FL, VIS-EXT Coated, Double-Convex Lens
Brand: TECHSPEC
SKU: 89-165
Price: ₹3,868.00

18mm Dia. x 18mm FL, VIS-EXT Coated, Double-Convex Lens

Diameter (mm):

18.00 +0.000/-0.025

Back Focal Length BFL (mm):

16.69

Effective Focal Length EFL (mm):

18.00

Coating:

VIS-EXT (350-700nm)

Coating Specification:

R_avg <0.5% @ 350 - 700nm

N-SF11

Surface Quality:

40-20

Power (P-V) @ 632.8nm:

1.5λ

Irregularity (P-V) @ 632.8nm:

λ/4

Centering (arcmin):

Bevel:

Protective bevel as needed

Center Thickness CT (mm):

4.50

Center Thickness Tolerance (mm):

±0.10

Edge Thickness ET (mm):

1.44

Radius R₁=-R₂ (mm):

27.22

Clear Aperture CA (mm):

17.00

f/#:

1.00

Focal Length Specification Wavelength (nm):

587.6

Focal Length Tolerance (%):

±1

Numerical Aperture NA:

0.50

Type:

Double-Convex Lens

Wavelength Range (nm):

350 - 700

Regulatory Compliance

RoHS 2015:

Compliant

Reach 224:

Compliant

Certificate of Conformance:

View

Product Family Description

AR Coated to Provide <0.5% Reflectance per Surface for 350 - 700nm
Minimize Aberrations Including Spherical and Coma
UV Fused Silica DCX Lenses Available
Other Coating Options Available: Uncoated, MgF₂, VIS 0°, NIR I, NIR II, VIS-NIR, and YAG-BBAR

TECHSPEC® VIS-EXT Coated Double-Convex (DCX) Lenses, also referred to as bi-convex lenses, have two positive, symmetrical faces with equal radii on both sides. These lenses are generally recommended for finite imaging applications with a conjugate ratio (ratio between object distance and image distance) between 0.2 and 5. At a conjugate ratio of 1, aberrations such as spherical aberration, chromatic aberration, coma, and distortion are minimized or cancelled due to the symmetric lens design. TECHSPEC VIS-EXT Coated Double-Convex Lenses are available in a variety of substrates and coating options for the visible and NIR spectra.

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