Achromatic Doublet Lens, Visible, 76.2 mm, 250 mm EFL, 430-700 nm

Technical Specs

  • Lens Type
    Achromatic Doublet
  • Lens Shape
    Plano-Convex
  • Diameter
    76.2 mm
  • Antireflection Coating
    430-700 nm
  • Coating Type
    Visible Multilayer
  • Coating Code
    AR.14
  • Damage Threshold
    7.5 J/cm2, 10 ns pulses, 10 Hz at 532 nm
  • Transmission
    T>95% visible, T>92% at 1064 nm
  • Lens Material
    N-BK7/N-F2
  • Surface Quality
    40-20 scratch-dig
  • Surface Flatness
    λ/4
  • Surface Accuracy, Power
    1.5 λ  
  • Effective Focal Length (EFL)
    250 mm
  • Back Focal Length (BFL)
    240.1 mm  
  • F/#
    3.3  
  • Radius of Curvature (R)
    140.890 mm  
  • Radius 2
    -101.720 mm
  • Radius 3
    -456.060 mm
  • Edge Thickness (Te)
    11.7 mm  
  • Center Thickness (Tc)
    18.5 mm  
  • Thickness, Center 1
    14.5 mm  
  • Thickness, Center 2
    4.0 mm  
  • Orientation
    Steepest convex surface should face the infinite conjugate
  • Design Wavelengths
    589 nm
  • Centration
    ≤3 arc min
  • Diameter Tolerance
    +0/-0.1 mm
  • Focal Length Tolerance
    ±2.0%
  • Center Thickness Tolerance
    ±0.4 mm
  • Clear Aperture
    90% of central diameter
  • Cleaning