ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.0 OD

Technical Specs

  • Size
    50.8 x 50.8 mm
  • Optical Density
    2
  • Optical Density Tolerance
    ±4%
  • Wavelength Range
    400-2000 nm
  • Material
    B270 Optical Crown Glass
  • Angle of Incidence
  • Wedge
    ≤5 arc min
  • Transmission
    1.0 % at 632.8 nm
  • Durability
    MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
  • Size Tolerance
    +0/-0.50 mm
  • Surface Flatness
    ≤5λ at 632.8 nm over the clear aperture
  • Surface Quality
    60-40 scratch-dig
  • Chamfers
    0.25–0.76 mm face width
  • Chamfers Angle Tolerance
    45° ±15°
  • Cleaning
  • Clear Aperture
    ≥central 80% of dimensions
  • Damage Threshold
    30 W/cm2 CW, typical; not recommended for pulsed laser use
  • Thickness
    3.0 mm
  • Thickness Tolerance
    ±0.25 mm