Stepped Neutral Density (ND) Filters NDFR-50S-3

Stepped Neutral Density (ND) Filters — Model NDFR-50S-3

ØØ50 mm.

Product Description

• Adjustable OD value by rotation the angle
• Circular, 8 or 10 different OD steps
• Applicable for 240 - 1200 nm wavelength

LBTEK Stepped Neutral Density (ND) Filter is composed of UV fused silica substrate and metal (Inconel) coating, designed for a transmission wavelength range of 240-1200 nm. The optical density (OD) range of the step neutral density filter is 0.04 to 1.0, 0.04 to 3.0, or 0.04 to 4.0, providing 8 or 10 steps of optical density adjustment through rotation. Available sizes include Ø50 mm and Ø100 mm, with coating radial angles of 297.5°±5.0° or 297.0°±5.0° depending on the size. In addition to standard step neutral density filters, LBTEK also offers various customization services. For specific customization requirements, please contact LBTEK Technical Support.

Stepped Neutral Density (ND) Filters

• Substrate material: UV fused silica
• Coating: Inconel
• Size: Ø50 mm or Ø100 mm

LBTEK Stepped Neutral Density Filters are composed of UV-grade fused silica substrates and metal (Inconel) coatings, designed for a transmission wavelength range of 240-1200 nm. The optical density (OD) range of step-type neutral density filters is 0.04 to 1.0, 0.04 to 3.0, or 0.04 to 4.0, providing 8 or 10 steps of optical density adjustment through rotation. Their center hole diameter is 7.5 mm, facilitating easy installation of mechanical components. Although these filters are reflective neutral density filters, the Inconel coating still absorbs some incident light. For optimal performance, it is recommended that light be incident from the side of the Inconel coating. Furthermore, care should be taken to avoid contact with the unprotected metal coating, as contact may scratch the unprotected surface. Air blowing is recommended for cleaning.