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E-84-128 2mm Dia. x 4mm FL, VIS-NIR Coated, Achromatic Lens

Fosco Connect Part No.: E-84128

  • $ 411.00 or



E-84128 2mm Dia. x 4mm FL, VIS-NIR Coated, Achromatic Lens

Product VIS-NIR Coating Curve

Product ISO

Product Drawing 

Product Family Description

  • Designed for 0° Angle of Incidence
  • Less Than 0.25% Reflectance Per Surface @ 880nm

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.

Diameter (mm): 2.00 +0.0/-0.025

Effective Focal Length EFL (mm): 4.00
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 2.92
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 1.6
Centering (arcmin): 30-45
Center Thickness CT 1 (mm): 1.00
Center Thickness CT 2 (mm): 1.00
Center Thickness Tolerance (mm): ±0.1
Radius R1 (mm): 2.26
Radius R2 (mm): -2.26
Radius R3 (mm): -10.00
Edge Thickness ET (mm): 1.72

Surface Quality: 20-10
f/#: 2.00
Numerical Aperture NA: 0.25

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
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