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Neutral Density Filters

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.

Specification

Substrate Material B-270 optical crown, UV grade fused silica

Outside Diameter 25mm, 30mm, 40mm, 45mm, 50mm, 60mm,100mm

Inside Diameter 7.5mm, 8.0mm, 8.3mm

Outside Diameter Tolerance +0/-0.25mm

Inside Diameter Tolerance +0.25/-0mm

Thickness 1.5mm+/-0.25mm，2mm+/-0.25mm

Parallelism +/-3 arc min.

Standard Linearity +/-5% of end density value

Deviation of Density End Point +/-5% of end density value

Design Wavelength 400-700nm Standard

380-2000nm ( B-270 )

250-2500nm ( Fused silica )

Coated Area 0 to 270 degree Standard

0 to 300 degree or 0 to 310 degree available

Optical density:(O.D) 0.04-1.0

0.04-1.5

0.04-2.0

0.04-3.0

0.04-4.0

Nore: Please refer our catalog to find more information about Neutral Density Filters.

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