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The Circular Variable Neutral Density filters (IR) are a filter wheel to linearly attenuate light as the filter is rotated. The CVND (IR) can be used for white light as well as for lasers. A large finite aperture can be attenuated by counter rotating to filters in series. Sizes are available from 25mm to over 200mm in ...
  • Attenuator Type: Absorptive
  • Shape: Round, Custom
  • Size: 25 - 200 mm
  • Optical Density: 0 to 1, 2, 3, 4 or 5 
  • Type Of Attenuator: Filter Wheel 
  • ...
Data Sheet
The Circular Variable Neutral Density filters (UV) are a filter wheel to linearly attenuate light as the filter is rotated. The CVND (UV) can be used for white light as well as for lasers. A large finite aperture can be attenuated by counter rotating to filters in series. Sizes are available from 25mm to over 200mm ...
  • Attenuator Type: Absorptive
  • Shape: Round, Custom
  • Size: 25 - 200 mm
  • Optical Density:
  • Type Of Attenuator: Filter Wheel 
  • ...
Data Sheet
The Circular Variable Neutral Density filters (VIS) are a filter wheel to linearly attenuate light as the filter is rotated. The CVND (VIS) can be used for white light as well as for lasers. A large finite aperture can be attenuated by counter rotating to filters in series. Sizes are available from 25mm to over 200mm in ...
  • Attenuator Type: Absorptive
  • Shape: Round, Custom
  • Size: 25-200 mm
  • Optical Density: 0 to 1, 2, 3, 4 or 5 
  • Type Of Attenuator: Filter Wheel  
  • ...
Data Sheet
Quality assurance and quality control regulations, such as ISO 9000, GLP, GMP and pharmacopoeias, require companies to verify that any spectrophotometers in use are performing at a consistently high level. Hellma Analytics\' certified reference materials can be used to test the following parameters easily and ...
  • Attenuator Type: Other
  • Shape: Square
  • Size: - mm
  • Optical Density:
  • Certified Wavelengths: 270, 280, 297, 321, 342 nm 
  • ...
Data Sheet
Quality assurance and quality control regulations, such as ISO 9000, GLP, GMP and pharmacopoeias, require companies to verify that any spectrophotometers in use are performing at a consistently high level. Hellma Analytics\' certified reference materials can be used to test the following parameters easily and ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: - mm
  • Optical Density: 0.25, 0.5, 1.0 Abs 
  • Certified Wavelengths: 279, 361, 453, 536, 638 nm 
  • ...
Data Sheet
Quality assurance and quality control regulations, such as ISO 9000, GLP, GMP and pharmacopoeias, require companies to verify that any spectrophotometers in use are performing at a consistently high level. Hellma Analytics\' certified reference materials can be used to test the following parameters easily and ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: - mm
  • Optical Density: 0.5, 1.0 F7 0.5-1.0 
  • Certified Wavelengths: 440, 465, 546.1, 590, 635 nm 
  • ...
Data Sheet
Quality assurance and quality control regulations, such as ISO 9000, GLP, GMP and pharmacopoeias, require companies to verify that any spectrophotometers in use are performing at a consistently high level. Hellma Analytics\' certified reference materials can be used to test the following parameters easily and ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: - mm
  • Optical Density: 0.25, 0.5, 1.0, Abs 
  • Certified Wavelengths: 440, 465, 546.1, 590, 635 nm 
  • ...
Data Sheet
Quality assurance and quality control regulations, such as ISO 9000, GLP, GMP and pharmacopoeias, require companies to verify that any spectrophotometers in use are performing at a consistently high level. Hellma Analytics\' certified reference materials can be used to test the following parameters easily and ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: - mm
  • Optical Density: 0.25, 0.5, 1.0, F7 0.5-1.0 
  • Certified Wavelengths: 279, 361, 453, 536, 638 nm 
  • ...
Data Sheet
Quality assurance and quality control regulations, such as ISO 9000, GLP, GMP and pharmacopoeias, require companies to verify that any spectrophotometers in use are performing at a consistently high level. Hellma Analytics\' certified reference materials can be used to test the following parameters easily and ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: - mm
  • Optical Density: 0.3, 1.5, 2.0 Abs 
  • Certified Wavelengths: 440, 465, 546.1, 590, 635 nm 
  • ...
Data Sheet
Circular Variable Filter 900 nm – 1350 nm
Delta Optical Thin Film A/S
CI Systems’ Circular Variable Filters (CVF’s) are interference narrow-pass filters of advanced design which are deposited on circular substrates, called segments. Film thickness, and therefore the wavelength of peak transmittance varies linearly and continuously with angular position on the segment. CI Systems CVF’s are ideally ...
  • Attenuator Type: Absorptive, Reflective
  • Shape: Round
  • Size: 2 mm
  • Optical Density: -- 
Data Sheet
Circular Variable Filter 7700 nm – 14300 nm
Delta Optical Thin Film A/S
CI Systems’ Circular Variable Filters (CVF’s) are interference narrow-pass filters of advanced design which are deposited on circular substrates, called segments. Film thickness, and therefore the wavelength of peak transmittance varies linearly and continuously with angular position on the segment. CI Systems CVF’s ...
  • Attenuator Type: Absorptive, Reflective
  • Shape: Round
  • Size: 2 mm
  • Optical Density: -- 
Data Sheet
Circular Variable Filter 4300 nm – 8100 nm
Delta Optical Thin Film A/S
CI Systems’ Circular Variable Filters (CVF’s) are interference narrow-pass filters of advanced design which are deposited on circular substrates, called segments. Film thickness, and therefore the wavelength of peak transmittance varies linearly and continuously with angular position on the segment. CI Systems CVF’s ...
  • Attenuator Type: Absorptive, Reflective
  • Shape: Round
  • Size: 2 mm
  • Optical Density: -- 
Data Sheet
This series of absorbing glass neutral density filters is offered in small increments from D=0.1 up to D=4. The thickness of the filters is controlled to produce a calibrated optical density at 546 nm. The response is approximately neutral so they can be used as broad band devices. However, if used at other wavelengths the optical ...
  • Attenuator Type: Absorptive
  • Shape: Round, Square
  • Size: 25.4 mm
  • Optical Density: 0.1 
Data Sheet
Material B270 Glass Dimension Tolerance +0.0/-0.2mm Thickness 1.5±0.2mm Flatness <2λ@632.8nm Surface Quality 60/40 scratch and dig Parallelism <3 arc minutes Clear Aperture >90% Design Wavelength 400-700nm Coating Metallic reflective coating OD Tolerance ±5% of OD Extremes
  • Attenuator Type: Other
  • Shape: Round, Square, Custom
  • Size: 50 mm
  • Optical Density: 0-3 
Data Sheet
Material B270 Glass Dimension Tolerance +0.0/-0.2mm Thickness 2.0±0.2mm Flatness 2λ@632.8nm Surface Quality 80/50 scratch and dig Parallelism <5 arc minutes Clear Aperture >90% Design Wavelength 400-700nm Coating Metallic reflective coating OD Tolerance ±10% of OD
  • Attenuator Type: Reflective
  • Shape: Round, Square, Custom
  • Size: 25.4 mm
  • Optical Density: 0.1-3 
Data Sheet
Material Absorptive Glass Dimension Tolerance +0.0/-0.2mm Thickness Tolerance ±0.2mm Flatness 2λ@632.8nm Surface Quality 80/50 scratch and dig Parallelism Clear Aperture >90% Design Wavelength 400-700nm OD Tolerance ±10% of OD  
  • Attenuator Type: Absorptive
  • Shape: Round, Square, Custom
  • Size: 25.4 mm
  • Optical Density: 0.1-3 
Data Sheet
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: 50 mm
  • Optical Density: 4.0 
Data Sheet
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: 50x50 mm
  • Optical Density: 0.1 
Data Sheet
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: 50 mm
  • Optical Density: 2.5 
Data Sheet
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...
  • Attenuator Type: Absorptive
  • Shape: Square
  • Size: 50 mm
  • Optical Density: 2.0 
Data Sheet

Did You know?

Neutral density filters are optical attenuators which have an approximately constant degree of attenuation (filter loss) in a substantial wavelength range. Attenuation is accomplished by either absorption using light absorbing glass or by a combination of absorption and reflection using a thin-film metal coating. The level of attenuation can be specified from optical density (OD) 0.04 to 4.0 where OD is defined as -log10 (T). By placing several neutral density filters from a large filter kit in series, one can realize many different degrees of total attenuation. A continuous adjustment of absorbance is possible with a rotatable neutral density filter wheel.