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All Products / Optics / Optical Lenses / Achromatic Lenses / VIS 0° Coated Achromatic Lenses
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

20mm Dia. x 25mm FL, VIS 0° Coated, Achromatic Lens

Any of our lenses with a diameter of 5mm or greater can be specified with blackened edges. To specify the blackening, simply append a –INK to the BBAR coated stock number.
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Stock #49-944 3-4 days
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Other Coating Options
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£85.00
Qty 1-5
£85.00
Qty 6+
£68.00
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Diameter (mm):
20.00 +0.0/-0.025
Effective Focal Length EFL (mm):
25.00
Focal Length Tolerance (%):
±1
Back Focal Length BFL (mm):
18.71
Focal Length Specification Wavelength (nm):
587.6
Clear Aperture CA (mm):
19.00
Centering (arcmin):
<1
Center Thickness CT (mm):
12.00 ±0.20
Center Thickness CT 1 (mm):
9.50 ±0.10
Center Thickness CT 2 (mm):
2.50 ±0.10
Radius R1 (mm):
18.03
Radius R2 (mm):
-13.27
Radius R3 (mm):
-55.46
Edge Thickness ET (mm):
8.06
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
N-BAF10 / N-SF6
Surface Quality:
40-20
f/#:
1.25
Numerical Aperture NA:
0.40
Coating:
VIS 0° (425-675nm)
Coating Specification:
Ravg ≤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
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Reach 219:
Compliant
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Certificate of Conformance:
View
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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

TECHSPEC® VIS 0° Coated Achromatic Lenses consist of two optical components cemented together to form an achromatic doublet. The doublet is computer optimized to correct for on-axis spherical and chromatic aberrations.  Achromatic lenses are best for applications involving multi-color (white light) imaging due to their specific doublet lens pairing that enables them to correct the color separation inherent in glass. TECHSPEC® VIS 0° Coated Achromatic Lenses provide optimized transmission for 425 – 675nm, reducing average reflection to 0.4%. MgF2 and VIS-NIR Coated Achromats are also available on our website.