New Negative Achromatic Doublet Lens, Visible, 6.35 mm, -25 mm EFL, 400-700 nm

  • Lens Type
    Negative Achromatic Doublet
  • Lens Shape
    Bi-Concave
  • Diameter
    6.35 mm
  • Antireflection Coating
    400-700 nm
  • Coating Type
    Visible Single-Layer MgF2 (Ravg≤1.75% )
  • Lens Material
    N-BAF10/N-SF10
  • Surface Quality
    40-20 scratch-dig
  • Surface Accuracy, Irregularity
    λ/4
  • Surface Accuracy, Power
    1.5 λ
  • Effective Focal Length (EFL)
    -25 mm
  • Back Focal Length (BFL)
    -26.53 mm
  • F/#
    4
  • Radius of Curvature (R)
    -17.57 mm
  • Radius 2
    11.48 mm
  • Radius 3
    109.44 mm
  • Edge Thickness (Te)
    3.27 mm
  • Center Thickness (Tc)
    3 mm
  • Design Wavelengths
    587.6 nm
  • Centration
    <1 arc min
  • Diameter Tolerance
    +0/-0.025 mm
  • Focal Length Tolerance
    ±2%
  • Center Thickness Tolerance
    ±0.2 mm
  • Clear Aperture
    5.625 mm