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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

20mm Dia. x 25mm FL, VIS-NIR Coated, Achromatic Lens

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Stock #49-956 3-4 days
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Other Coating Options
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€104,00
Qty 1-5
€104,00
Qty 6+
€83,25
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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
Surface Quality:
40-20
f/#:
1.25
Numerical Aperture NA:
0.40
Coating:
VIS-NIR (400-1000nm)
Coating Specification:
Rabs ≤0.25% @ 880nm
Ravg ≤1.25% @ 400 - 870nm
Ravg ≤1.25% @ 890 - 1000nm
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 - 1000

Regulatory Compliance

RoHS 2015:
Reach 219:
Certificate of Conformance:

Product Family Description

  • Designed for 0° Angle of Incidence
  • Less Than 0.25% Reflectance Per Surface @ 880nm
  • MgF2 and VIS 0° Coated Achromats Also Available

TECHSPEC® VIS-NIR 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. TECHSPEC® VIS-NIR Coated Achromatic Lenses have visible/near-infrared broadband anti-reflection coating, which is specially optimized to yield maximum transmission (>99%) in the near-infrared. The achromatic lenses reduce reflection to less than 0.25 percent per surface at 880nm. Magnesium Fluoride coated and VIS 0° coated achromats are also available.