ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.5 OD
ND Filter, Metallic, Optical Crown Glass, 50.8 x 50.8 mm, 2.5 OD
Model: FBS-ND25
Product Series Overview
Optical Crown Glass Metallic ND FiltersThe FBS-ND25 Metallic Neutral Density Filter is a 50.8 x 50.8 mm square Optical Crown Glass Metallic ND Filter with an optical density of 2.5 at 632.8 nm. Our metallic neutral density coatings provide broadband attenuation for low power applications. The coating is deposited on one side of a cost effective B 270 optical glass substrate, providing excellent performance in the visible and near-infrared.
Specifications
- Size50.8 x 50.8 mm
- Wavelength Range400-1200 nm
- Optical Density2.5
- Optical Density Tolerance±4% @ 632.8 nm
- Transmission0.3% @ 632.8 nm
- Angle of Incidence0°
- MaterialB270 Optical Crown Glass or Equivalent
- Damage Threshold30 W/cm2 CW, typical; not recommended for pulsed laser use
- Size Tolerance+0/-0.50 mm
- Thickness3.0 mm
- Thickness Tolerance±0.25 mm
- Surface Flatness≤5λ at 632.8 nm over the clear aperture
- Surface Quality60-40 scratch-dig
- Clear Aperture≥central 80% of dimensions
- Wedge≤5 arc min
- Chamfers0.25–0.76 mm face width
- Chamfers Angle Tolerance45° ±15°
- DurabilityMIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
- Cleaning
Resources & Downloads
2D Product Drawings
NEUTRALD-20S.pdf(59.9 kB, PDF)
Other
FBS-ND25 RoHS Certificate(264.7 kB, PDF) FBS-ND25_ROHS2-2021.pdf(280.2 kB, PDF)
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