Plano-Concave Lens, Fused Silica, 25.4 mm, -250 mm EFL, Uncoated

Technical Specs

  • Lens Shape
    Plano-Concave
  • Diameter
    25.4 mm
  • Lens Material
    UV Fused Silica
  • Antireflection Coating
    Uncoated
  • Surface Quality
    20-10 scratch-dig
  • Surface Accuracy, Irregularity
    λ/4
  • Surface Accuracy, Power
    1.5 λ  
  • Surface Flatness
    λ/4
  • F/#
    -9.8  
  • Effective Focal Length (EFL)
    -250 mm  
  • Back Focal Length (BFL)
    -251.71 mm  
  • Radius of Curvature (R)
    -114.750 mm  
  • Edge Thickness (Te)
    3.07 mm  
  • Center Thickness (Tc)
    2.5 mm
  • Principal Plane 2 (P2)
    -1.71 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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