Circular Variable Neutral Density Filters
Description
Circular ND filters provide continuously variable, linear attenuation of light by rotating the filter about its center. Transmitted intensity varies as a function of the optical density range.
The filter can be used for white light as well as for lasers.
A large finite aperture can be attenuated by counter rotating two filters in series.
Sizes are available from 25 mm to over 100 mm in diameter. The useable wavelength range is from 250nm to 2500nm.
Distribution of optical density |
Standard Specifications
| Operating wavelength range |
380-2000nm ( B-270 ); 250-2500nm (UV grade Fused silica) |
| Design Wavelength |
400-700nm |
| Outside Diameter |
25mm; 50mm; 100mm |
| Inside Diameter |
8.3mm |
| Material |
B-270 optical crown; UV grade Fused Silica |
| Parallelism |
+/-3 arcmin |
| Coated Area |
0 to 270o |
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