Experience unparalleled control over light with our Continuously Neutral Density Filters. Crafted from BK7 fine annealed material with meticulous dimension tolerance (+0.0/-0.2), these filters boast a clear aperture covering 90% of length and 80% of width. The optical density seamlessly varies from 0.8 to 2.0 with a tight tolerance of ±5% at 632.8nm, thanks to a thin film of Ni-Cr-Fe protected by SiO overcoat.

The Linearity of Optical Density is maintained at an impressive ±5%, ensuring consistent performance. The filters are coated with a dual-layer system: S1 utilizes Ni-Cr-Fe for attenuation, while S2 features a Broadband AR coating with Rave<0.5% for 420-675nm at 0-15º incidence, enhancing visibility in the visible and near-infrared region.

Key Features:

• Linearly varying optical density
• High precision with dimension tolerance of +0.0/-0.2
• Clear aperture covering 90% of length and 80% of width
• Optical density range of 0.8-2.0±5% at 632.8nm
• Dual-coating system for optimal performance
• Linearity of Optical Density maintained within ±5%

Applications: Ideal for applications requiring precise light control, such as photography, spectroscopy, and optical experiments. These filters find utility in environments where linear attenuation or beamsplitting in the visible and near-infrared region is crucial for achieving desired outcomes. Elevate your optical experience with our Continuous ND Filters – the epitome of precision and versatility.