Plano-Concave Lens, N-BK7, 25.4 mm Diameter, -200 mm EFL, 430-700 nm

Technical Specs

  • Lens Shape
    Plano-Concave
  • Diameter
    25.4 mm
  • Lens Material
    N-BK7
  • 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
  • Surface Quality
    40-20 scratch-dig
  • Surface Accuracy, Irregularity
    λ/4
  • Surface Accuracy, Power
    1.5 λ  
  • Surface Flatness
    λ/4
  • F/#
    -7.8  
  • Effective Focal Length (EFL)
    -200 mm  
  • Back Focal Length (BFL)
    -201.64 mm  
  • Radius of Curvature (R)
    -103.360 mm  
  • Edge Thickness (Te)
    3.13 mm  
  • Center Thickness (Tc)
    2.5 mm  
  • Principal Plane 2 (P2)
    -1.64 mm  
  • Design Wavelength
    589 nm
  • Centration
    ≤3 arc min
  • Chamfers
    0–0.8 mm face width
  • Chamfers Angle/Tolerance
    45° ±15°, typical
  • Focal Length Tolerance
    ±1 %
  • Diameter Tolerance
    +0/-0.1 mm
  • Center Thickness Tolerance
    ±0.1 mm
  • Clear Aperture
    ≥central 90% of diameter
  • Cleaning

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