We provide our customers with circular ND filters. This filter provides continuously variable linear light intensity attenuation by rotating the filter around its center. The transmitted intensity varies with the optical density range. This filter can be used in natural light as well as in laser applications.
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Catalog Number
ACMA00028485
Product Name
Circular Variable Neutral Density BK7 Filters, Ø25mm, density 0.04-2
Diameter
Inner hole diameter 8.0 mm
Outer diameter Ø25 mm
Thickness
1.75 mm
DimensionTolerance
inner hole diameter±0.15 mm; outside hole diameter±0.15 mm
Coating
coated area 0-270 deg
Flatness
<λ@632.8 nm
Parallelism
<3 arcmin
Surface Quality
60-40 S-D
ClearAperture
>90%
Density
optical density 0.04-2
Wavelength
calibration wavelength 532 nm
Transmission
average transmission in vis 90% to 1%
Material
BK7
Type
Reflective metal-coated (gradient thickness metal layer)
Operating Wavelength Range
380-2000 nm
MSDS
COA
Spec Sheet
1. The product has a wide working wavelength range; 2. The product can maintain the transmission spectral profile;
Continuously variable light attenuation over a wide wavelength range.